context: It is probable that Winona is a cat. It is likely that Mary grabbed the milk. It is likely that Bernhard is a frog. It is probably not the case that if 'Mary grabbed the milk and Winona is a cat' then Julius is a rhino. It is probably the case that if either 'Winona is a cat' or 'Bernhard is a frog' but not both then Lily is a swan. It is likely that if 'Bernhard is a frog' or 'Winona is a cat' or both then John moved to the office.
hypothesis: It is likely that 'Lily is a swan and Winona is a cat'.
valid_hypothesis: It is improbable that 'Lily is a swan and Winona is a cat'.
invalid_hypothesis: It is likely that 'Lily is a swan and Winona is a cat'.
problog: 
    and(A,B) :- A,B.
    or(A,B) :- A;B.
    nand(A,B) :- not(and(A,B)).
    nor(A,B) :- not(or(A,B)).
    xor(A,B) :- or(A,B), nand(A,B).
  
    %hop0
    0.7::factA.
    0.7::factB.
    0.7::factC.
    %hop1
    0.25::factX:-and(factB,factA).
    0.7::factY:-xor(factA,factC).
    0.7::factZ:-or(factC,factA).
  
    %hop2
    conclusion:-and(factY,factA).
  
    query(conclusion).
    
hypothesis_assertion: 'Lily is a swan and Winona is a cat'.