update math words

requirements.txt

@@ -5,3 +5,4 @@ scipy==1.9.2
 torch==2.3.1
 transformers==4.46.1
 nltk==3.9.1
+inflect==7.5.0

utils.py

@@ -7,6 +7,7 @@ from cleantext import clean
 from num2words import num2words
 import re
 import string
+import inflect
 
 punct_chars = list((set(string.punctuation) | {'’', '‘', '–', '—', '~', '|', '“', '”', '…', "'", "`", '_'}))
 punct_chars.sort()
@@ -34,530 +35,708 @@ MATH_PREFIXES = [
     "median",
     "ratio",
     "area",
-]
 
-MATH_WORDS = [
-    "absolute value",
-    "algebra",
-    "area",
-    "average",
-    "base of",
-    "box plot",
-    "categorical",
-    "coefficient",
-    "common factor",
-    "common multiple",
-    "compose",
-    "coordinate",
-    "cubed",
-    "decompose",
-    "dependent variable",
-    "distribution",
-    "dot plot",
-    "double number line diagram",
-    "equivalent",
-    "equivalent expression",
-    "ratio",
-    "exponent",
-    "frequency",
-    "greatest common factor",
-    "gcd",
-    "height of",
-    "histogram",
-    "independent variable",
-    "integer",
-    "interquartile range",
-    "iqr",
-    "least common multiple",
-    "long division",
-    "mean absolute deviation",
-    "median",
-    "negative number",
-    "opposite vertex",
-    "parallelogram",
-    "percent",
-    "polygon",
-    "polyhedron",
-    "positive number",
-    "prism",
-    "pyramid",
-    "quadrant",
-    "quadrilateral",
-    "quartile",
-    "rational number",
-    "reciprocal",
-    "equality",
-    "inequality",
-    "squared",
-    "statistic",
-    "surface area",
-    "identity property",
-    "addend",
-    "unit",
-    "number sentence",
-    "make ten",
-    "take from ten",
-    "number bond",
-    "total",
-    "estimate",
-    "hashmark",
-    "meter",
-    "number line",
-    "ruler",
-    "centimeter",
-    "base ten",
-    "expanded form",
-    "hundred",
-    "thousand",
-    "place value",
-    "number disk",
-    "standard form",
-    "unit form",
-    "word form",
-    "tens place",
-    "algorithm",
-    "equation",
-    "simplif",
-    "addition",
-    "subtract",
-    "array",
-    "even number",
-    "odd number",
-    "repeated addition",
-    "tessellat",
-    "whole number",
-    "number path",
-    "rectangle",
-    "square",
-    "bar graph",
-    "data",
-    "degree",
-    "line plot",
-    "picture graph",
-    "scale",
-    "survey",
-    "thermometer",
-    "estimat",
-    "tape diagram",
-    "value",
-    "analog",
-    "angle",
-    "parallel",
-    "partition",
-    "pentagon",
-    "right angle",
-    "cube",
-    "digital",
-    "quarter of",
-    "tangram",
-    "circle",
-    "hexagon",
-    "half circle",
-    "half-circle",
-    "quarter circle",
-    "quarter-circle",
-    "semicircle",
-    "semi-circle",
-    "rectang",
-    "rhombus",
-    "trapezoid",
-    "triangle",
-    "commutative",
-    "equal group",
-    "distributive",
-    "divide",
-    "division",
+    # added
     "multipl",
-    "parentheses",
-    "quotient",
-    "rotate",
-    "unknown",
-    "add",
-    "capacity",
-    "continuous",
-    "endpoint",
-    "gram",
-    "interval",
-    "kilogram",
-    "volume",
-    "liter",
-    "milliliter",
-    "approximate",
-    "area model",
-    "square unit",
-    "unit square",
+    "divid",
+    "subtrac",
+    "logarit",
+    "algebr",
+    "calcul",
+    "matri",
+    "vect",
     "geometr",
-    "equivalent fraction",
-    "fraction form",
-    "fractional unit",
-    "unit fraction",
-    "unit interval",
-    "measur",
-    "graph",
-    "scaled graph",
-    "diagonal",
-    "perimeter",
-    "regular polygon",
-    "tessellate",
-    "tetromino",
-    "heptagon",
-    "octagon",
-    "digit",
-    "expression",
-    "sum",
-    "kilometer",
-    "mass",
-    "mixed unit",
-    "length",
+    "statist",
+    "probabli",
+    "coeffi",
     "measure",
-    "simplify",
-    "associative",
-    "composite",
-    "divisible",
-    "divisor",
-    "partial product",
-    "prime number",
-    "remainder",
-    "acute",
-    "arc",
-    "collinear",
-    "equilateral",
-    "intersect",
-    "isosceles",
-    "symmetry",
-    "line segment",
-    "line",
-    "obtuse",
-    "perpendicular",
-    "protractor",
-    "scalene",
-    "straight angle",
-    "supplementary angle",
-    "vertex",
-    "common denominator",
-    "denominator",
-    "fraction",
-    "mixed number",
-    "numerator",
-    "whole",
-    "decimal expanded form",
-    "decimal",
-    "hundredth",
-    "tenth",
-    "customary system of measurement",
-    "customary unit",
-    "gallon",
-    "metric",
-    "metric unit",
-    "ounce",
-    "pint",
-    "quart",
-    "convert",
-    "distance",
-    "millimeter",
-    "thousandth",
-    "hundredths",
-    "conversion factor",
-    "decimal fraction",
-    "multiplier",
-    "equivalence",
-    "multiple",
-    "product",
-    "benchmark fraction",
-    "cup",
-    "pound",
-    "yard",
-    "whole unit",
-    "decimal divisor",
-    "factors",
-    "bisect",
-    "cubic units",
-    "hierarchy",
-    "unit cube",
-    "attribute",
-    "kite",
-    "bisector",
-    "solid figure",
-    "square units",
-    "dimension",
-    "axis",
-    "ordered pair",
-    "angle measure",
-    "horizontal",
-    "vertical",
-    "categorical data",
-    "lcm",
-    "measure of center",
-    "meters per second",
-    "numerical",
-    "solution",
-    "unit price",
-    "unit rate",
-    "variability",
-    "variable",
+    "simplif"
+]
+
+MATH_WORDS = [
+    "absolute deviation",
+    "absolute value",
     "abundant number",
     "accurate",
     "acre",
+    "acute",
+    "add",
+    "addend",
     "addition fact",
+    "addition",
+    "additive identity",
+    "additive inverse",
+    "adjacent",
+    "algebra",
     "algebraic",
+    "algorithm",
+    "alternate interior angle",
     "altitude",
+    "analog",
+    "angle measure",
+    "angle",
+    "angular",
     "apex",
-    "arithmetic facts",
+    "approximate",
+    "arc",
+    "area model",
+    "area",
+    "arithmetic fact",
+    "arithmetic",
+    "array",
     "associative property",
+    "associative",
     "astronomical unit",
+    "attribute",
+    "average",
+    "axis",
+    "bar graph",
+    "base of a parallelogram",
+    "base of a prism",
+    "base of a pyramid",
+    "base of a triangle",
+    "base of an exponent",
+    "base of",
+    "base ten",
     "base",
     "baseline",
+    "benchmark fraction",
     "billion",
+    "binomial",
+    "bisect",
+    "bisector",
+    "box and whisker plot",
+    "box plot",
+    "capacity",
+    "cartesian coordinate",
+    "categorical data",
+    "categorical",
     "celsius",
     "census",
     "cent",
     "center of a circle",
+    "center of a dilation",
     "center of a sphere",
+    "center",
+    "centimeter",
+    "central angle",
+    "centroid",
+    "chance experiment",
     "chance",
+    "chord",
     "circle graph",
+    "circle",
+    "circular",
+    "circumference",
+    "clockwise",
+    "coefficient",
+    "collinear",
+    "column matrix"
     "column",
+    "combination",
     "combine",
+    "common denominator",
+    "common factor",
     "common fraction",
+    "common multiple",
+    "commutative property",
+    "commutative",
     "comparison diagram",
     "comparison story",
     "compass",
     "complement",
+    "complementary",
+    "compose",
+    "composite",
     "concave polygon",
     "concentric circles",
+    "concentric",
+    "cone",
+    "congruent",
     "consecutive",
+    "constant function",
     "constant",
     "continuous model of area",
     "continuous model of volume",
+    "continuous",
     "contour",
     "conversion fact",
+    "conversion factor",
+    "convert",
+    "convex function",
     "convex polygon",
+    "coordinate",
+    "coplanar",
+    "corresponding",
+    "counterclockwise",
     "counting numbers",
     "counting up subtraction",
+    "covariance",
+    "covariate",
     "cover-up method",
     "cross multiplication",
+    "cross product",
+    "cross section",
+    "cross-section",
+    "cube root",
+    "cube",
+    "cubed",
+    "cubic unit",
     "cubic",
     "cubit",
+    "cup",
     "curved surface",
+    "customary system of measurement",
+    "customary unit",
     "cylinder",
+    "cylindrical",
+    "data",
     "decagon",
+    "decimal divisor",
+    "decimal expanded form",
+    "decimal fraction",
+    "decimal point",
+    "decimal",
     "decimeter",
+    "decompose",
     "deficient number",
+    "degree",
+    "delta",
+    "denominator",
     "density",
+    "dependent event",
+    "dependent variable",
+    "deposit",
+    "derivative",
+    "determinant",
+    "diagonal",
+    "diameter",
+    "difference",
+    "differential"
+    "digit",
+    "digital",
+    "dilation",
+    "dimension",
     "discrete model",
     "displacement method",
+    "distance",
+    "distribution",
+    "distributive",
+    "divide",
+    "dividend",
     "divisibility test",
     "divisible by",
+    "divisible",
+    "division",
+    "divisor",
     "dodecahedron",
+    "dot plot",
+    "double number line diagram",
     "double stem plot",
     "doubles fact",
+    "edge",
     "egyptian multiplication",
     "elevation",
     "embed figure",
     "end point",
+    "endpoint",
     "enlarge",
+    "equal group",
+    "equal part",
     "equal",
-    "equal groups",
-    "equal parts",
-    "equidistant marks",
+    "equality",
+    "equation",
+    "equidistant mark",
     "equilateral polygon",
-    "equivalent fractions",
+    "equilateral triangle",
+    "equilateral",
+    "equivalence",
+    "equivalent expression",
+    "equivalent fraction",
+    "equivalent",
+    "error bound",
+    "error of measurement",
+    "estimat",
+    "estimate",
     "european subtraction",
+    "even number",
+    "event",
+    "expand",
+    "expanded form",
     "expanded notation",
     "expected outcome",
-    "exponential",
-    "extended facts",
+    "expected value",
+    "exponent",
+    "exponential function",
+    "exponential growth",
+    "expression",
+    "extended fact",
+    "face",
     "fact power",
     "fact triangle",
     "factor",
-    "factors of numbers",
+    "factorial",
+    "factors of number",
     "fahrenheit",
     "false number sentence",
-    "figurate numbers",
+    "figurate number",
     "flowchart",
     "fluid ounce",
+    "formula",
+    "fraction form",
+    "fraction",
     "fractional part",
+    "fractional unit",
+    "frequency",
     "fulcrum",
     "function machine",
+    "function",
     "furlong",
+    "gallon",
+    "gcd",
     "genus",
     "geoboard",
+    "geometr",
     "geometric solid",
     "geometry template",
     "girth",
     "golden ratio",
     "golden rectangle",
+    "gram",
     "graph key",
+    "graph",
+    "greatest common divisor"
+    "greatest common factor",
     "grouping symbol",
+    "half circle",
+    "half-circle",
+    "hashmark",
+    "height of a parallelogram or triangle",
+    "height of",
+    "height",
     "hemisphere",
+    "heptagon",
+    "heptagonal",
+    "hexagon",
+    "hexagonal",
+    "hierarchy",
+    "histogram",
+    "horizontal shift",
+    "horizontal stretch",
+    "horizontal",
+    "hundred",
+    "hundredth",
+    "hypotenuse",
+    "hypothesis",
     "icosahedron",
+    "identity function",
+    "identity matrix",
+    "identity property of",
+    "identity property",
     "improper fraction",
     "inch",
-    "index of locations",
+    "incircle",
+    "indefinite integral",
+    "independent event",
+    "independent variable",
+    "index of location",
     "indirect measurement",
+    "inequality",
+    "infinity",
     "input",
+    "inscribed angle",
     "inscribed polygon",
     "instance of a pattern",
+    "integer",
+    "intercept",
+    "intercepted arc",
+    "interior angle",
     "interior of a figure",
     "interpolate",
+    "interquartile range",
+    "intersect",
+    "interval",
+    "inverse operation",
+    "inverse",
+    "iqr",
+    "irrational number",
+    "irrational root",
     "irrational",
     "isometry transformation",
     "isosceles trapezoid",
+    "isosceles triangle",
+    "isosceles",
+    "joint probability",
+    "joint variation",
     "juxtapose",
     "key sequence",
+    "kilogram",
+    "kilometer",
+    "kite",
     "label",
     "landmark",
     "latitude",
     "lattice multiplication",
+    "lcm",
+    "least common denominator",
+    "least common multiple",
     "left to right subtraction",
     "leg of a right triangle",
+    "legs",
+    "length",
+    "like fraction",
     "like terms",
     "line graph",
     "line of reflection",
     "line of symmetry",
+    "line plot",
+    "line segment",
     "line symmetry",
+    "line",
+    "linear relationship",
     "lines of latitude",
     "lines of longitude",
+    "liter",
+    "local maximum",
+    "local minimum",
+    "locus",
+    "logarithm",
+    "logarithmic function",
+    "logarithmic scale",
+    "logic",
+    "long division",
     "longitude",
+    "lowest term",
     "magnitude estimate",
+    "make ten",
     "map legend",
     "map scale",
+    "mass",
     "maximum",
+    "mean absolute deviation",
+    "mean value",
+    "mean",
+    "measure of center",
+    "measure",
     "measurement division",
+    "measurement error",
     "measurement unit",
+    "median",
     "meridian bar",
+    "meter",
+    "meters per second",
     "metric system",
+    "metric unit",
+    "metric",
     "midpoint",
     "mile",
+    "milliliter",
+    "millimeter",
     "millisecond",
     "minimum",
     "minuend",
     "mirror image",
+    "mixed number",
+    "mixed unit",
     "mobius",
     "modal",
+    "mode",
+    "multipl",
+    "multiple",
     "multiplication counting principle",
     "multiplication diagram",
     "multiplication fact",
-    "multiplication symbols",
+    "multiplication symbol",
     "multiplication use class",
-    "negative rational numbers",
+    "multiplicative identity",
+    "multiplicative inverse",
+    "multiplier",
+    "mutually exclusive event",
+    "natural number",
+    "negative association",
+    "negative exponent",
+    "negative number",
+    "negative rational number",
     "nested parentheses",
     "net score",
     "net weight",
+    "net",
     "nonagon",
     "nonconvex polygon",
+    "nonlinear",
+    "normal distribution",
     "normal span",
+    "normal",
+    "number bond",
+    "number disk",
     "number grid",
+    "number line",
+    "number path",
+    "number sentence",
     "number sequence",
     "numeral",
     "numeration",
+    "numerator",
+    "numerical data",
+    "numerical",
+    "obtuse",
+    "octagon",
+    "octagonal",
     "octahedron",
+    "odd number",
     "open proportion",
-    "operation",
     "operation symbol",
+    "operational",
     "opposite angle",
     "opposite change rule",
     "opposite of a number",
     "opposite side",
+    "opposite vertex",
+    "opposite",
     "order of magnitude",
     "order of operations",
     "order of rotation symmetry",
+    "order of",
+    "ordered pair",
+    "ordered",
     "ordinal number",
+    "orthogonal",
+    "ounce",
+    "outlier",
+    "pace",
     "pan balance",
     "parabola",
     "parallel lines",
-    "parallel planes",
+    "parallel plane",
+    "parallel",
+    "parallelogram",
+    "parentheses",
     "part to part ratio",
     "part to whole ratio",
     "part whole fraction",
     "partial differences subtraction",
+    "partial product",
     "partial products multiplication",
     "partial quotients division",
     "partial sums addition",
+    "partition",
     "partitive division",
     "parts and total diagram",
+    "pentagon",
+    "pentagonal",
     "per capita",
     "per unit rate",
+    "per",
     "percent circle",
+    "percent",
+    "percentage",
     "perfect number",
+    "perfect square",
+    "perfect triangle",
+    "perimeter",
+    "permutation",
+    "perpendicular",
     "perpetual calendar",
+    "pi",
+    "picture graph",
     "pie graph",
-    "plane",
+    "pint",
+    "pivot",
+    "place value",
     "plane figure",
+    "plane",
     "point symmetry",
+    "point",
+    "polar coordinate",
+    "polygon",
+    "polyhedron",
+    "polynominal"
     "population density",
+    "population",
+    "positive association",
+    "positive number",
+    "pound",
+    "power",
     "precise",
     "predict",
     "prediction line",
     "preimage",
+    "prime factor",
     "prime factorization",
     "prime meridian",
-    "probability",
+    "prime number",
+    "prism",
     "probability meter",
     "probability tree diagram",
+    "probability",
+    "product",
     "proper factor",
     "proper fraction",
     "property",
+    "proportion",
+    "proportional",
+    "proportionality",
+    "protractor",
+    "pyramid",
+    "pythagorean theorem",
     "quadrangle",
+    "quadrant",
+    "quadratic",
+    "quadrilateral",
+    "quart",
+    "quarter circle",
+    "quarter of",
+    "quarter-circle",
+    "quartile",
     "quick common denominator",
+    "quotient",
     "quotitive division",
+    "radian",
+    "radius of"
+    "radius",
     "random draw",
     "random experiment",
     "random number",
     "random sample",
+    "random",
+    "range",
     "rank",
     "rate diagram",
     "rate multiplication ",
+    "rate of change",
     "rate unit",
+    "rate",
+    "ratio of",
+    "ratio",
+    "rational equation",
+    "rational number",
+    "ray",
+    "real number",
     "recall survey",
+    "reciprocal",
+    "rectang",
+    "rectangle",
     "rectangular array",
     "rectangular coordinate grid",
     "rectangular prism",
     "rectangular pyramid",
+    "rectangular",
     "rectilinear figure",
     "reflection",
     "reflex angle",
+    "region",
+    "regular polygon",
     "regular polyhedron",
     "regular tessellation",
     "relation symbol",
+    "relative frequency",
+    "remainder",
+    "repeated addition",
+    "repeating decimal",
+    "representative",
     "revolution",
+    "rhombus",
+    "right angle",
     "right cone",
     "right cylinder",
     "right prism",
     "right pyramid",
     "right triangle",
+    "rigid transformation",
     "roman numerals",
+    "root",
+    "rotate",
     "rotation symmetry",
+    "rotation",
+    "round off",
+    "round-off",
+    "ruler",
     "same change rule for subtraction",
+    "sample",
+    "scalar",
+    "scale factor",
     "scale model",
     "scale of a map",
     "scale of a number line",
+    "scale",
+    "scaled graph",
+    "scaled",
+    "scalene triangle",
+    "scalene",
+    "scatter plot",
+    "scattergram",
     "sector",
     "segment",
+    "semi-circle",
+    "semicircle",
     "sequence",
-    "significant digits",
+    "set",
+    "sign",
+    "significant digit",
+    "significant figure",
     "similar figures",
+    "similar",
     "simpler form",
+    "simplify",
+    "simulation",
     "situtation diagram",
-    "skew lines",
+    "skew line",
     "slanted",
     "slide rule",
+    "slope",
+    "solid figure",
+    "solution",
     "span",
+    "speed",
+    "sphere",
+    "square root",
+    "square unit",
+    "square",
+    "squared",
     "stacked bar graph",
+    "standard form",
     "standard unit",
+    "statistic",
     "stem and leaf plot",
     "step graph",
+    "straight angle",
     "straightedge",
+    "subset of"
     "substitute",
+    "subtract",
     "subtrahend",
+    "sum of",
+    "sum",
+    "supplementary angle",
+    "surface area",
     "surface",
+    "survey",
     "symmetric",
+    "symmetry",
+    "system of equation",
+    "system of",
+    "table",
+    "take from ten",
     "tally",
+    "tangent circle",
     "tangent",
-    "tangent circles",
+    "tangram",
+    "tape diagram",
     "temperature",
     "template",
+    "tens place",
+    "tenth",
+    "term",
+    "terminating decimal",
+    "tessellat",
+    "tessellate",
+    "tessellation",
     "tetrahedron",
+    "tetromino",
     "theorem",
+    "thermometer",
+    "thousand",
+    "thousandth",
     "tile",
     "tiling",
     "time graph",
@@ -565,159 +744,79 @@ MATH_WORDS = [
     "top heavy fraction",
     "topological",
     "topology",
+    "total area",
+    "total of",
+    "total surface",
+    "total volume",
     "trade first subtraction",
+    "transformation",
+    "translation",
+    "transversal",
+    "trapezoid",
     "tree diagram",
+    "triangle",
     "triangular",
     "true number sentence",
     "truncate",
-    "twin primes",
-    "unlike denominators",
-    "unlike fractions",
+    "twin prime",
+    "two-way table",
+    "unit cube",
+    "unit form",
+    "unit fraction",
+    "unit interval",
+    "unit price",
+    "unit rate",
+    "unit square",
+    "unit",
+    "unknown",
+    "unlike denominator",
+    "unlike fraction",
+    "value",
     "vanishing ",
+    "variability",
+    "variable",
+    "velocity",
     "venn diagram",
     "vernal equinox",
+    "vertex",
+    "vertical",
+    "volume of",
+    "volume",
     "weight",
+    "whole number",
+    "whole unit",
+    "whole",
     "width",
-    "base of a prism",
-    "base of a pyramid",
-    "face",
-    "numerical data",
-    "opposite",
-    "pace",
-    "per",
-    "region",
-    "sign",
-    "alternate interior angles",
-    "base of an exponent",
-    "cone",
-    "congruent",
-    "counterclockwise",
-    "cube root",
-    "hypotenuse",
-    "irrational number",
-    "linear relationship",
-    "positive association",
-    "rate of change",
-    "translation",
-    "transversal",
-    "circumference",
-    "corresponding",
-    "expand",
-    "population",
-    "proportion",
-    "radius",
-    "random",
-    "repeating decimal",
-    "representative",
-    "scaled",
     "withdrawal",
-    "center",
-    "edge",
-    "height of a parallelogram or triangle",
-    "net",
-    "speed",
-    "table",
-    "term",
-    "adjacent",
-    "complementary",
-    "cross-section",
-    "cross section",
-    "deposit",
-    "event",
-    "measurement error",
-    "proportional",
-    "simulation",
-    "center of a dilation",
-    "clockwise",
-    "dilation",
-    "function",
-    "negative association",
-    "pythagorean theorem",
-    "relative frequency",
-    "rigid transformation",
-    "scale factor",
-    "scatter plot",
-    "similar",
-    "sphere",
-    "two-way table",
-    "additive identity",
-    "additive inverse",
-    "box and whisker plot",
-    "cartesian coordinates",
-    "central angle",
-    "chord",
-    "combination",
-    "commutative property",
-    "coplanar",
-    "cross product",
-    "dependent events",
-    "difference",
-    "dividend",
-    "equilateral triangle",
-    "error of measurement",
-    "factorial",
-    "formula",
-    "identity property of",
-    "independent events",
-    "infinity",
-    "inscribed angle",
-    "intercept",
-    "intercepted arc",
-    "inverse",
-    "inverse operations",
-    "isosceles triangle",
-    "least common denominator",
-    "like fractions",
-    "locus",
-    "logic",
-    "lowest terms",
-    "mode",
-    "multiplicative identity",
-    "multiplicative inverse",
-    "mutually exclusive events",
-    "natural numbers",
-    "normal",
-    "permutation",
-    "pi",
-    "point",
-    "power",
-    "range",
-    "rate",
-    "ray",
-    "real numbers",
-    "rectangular",
-    "root",
-    "rotation",
-    "scalene triangle",
-    "scattergram",
-    "set",
-    "statistics",
-    "terminating decimal",
-    "transformation",
+    "word form",
+    "x axes",
+    "x axis",
     "x intercept",
+    "x-axes",
     "x-axis",
-    "x-intercept",
+    "y axes",
+    "y axis",
     "y intercept",
+    "y-axes",
     "y-axis",
     "y-intercept",
-    "zero",
+    "yard",
     "zero property of multiplication",
-    "base of a parallelogram",
-    "base of a triangle",
-    "height",
-    "chance experiment",
-    "diameter",
-    "mean",
-    "percentage",
-    "sample",
-    "legs",
-    "outlier",
-    "slope",
-    "square root",
-    "system of equations",
-    "tessellation",
+    "zero",
 ]
 
+
+p = inflect.engine()
+
+def singular_to_plural(word):
+    """Convert singular words to plural using inflect."""
+    plural = p.plural(word)
+    return plural if plural else word  
+
+plural_MATH_WORDS = [singular_to_plural(word) for word in MATH_WORDS]
+
+MATH_WORDS += plural_MATH_WORDS
+
 def get_num_words(text):
     if not isinstance(text, str):
         print("%s is not a string" % text)