context: There is a very good chance that Julius is gray. It is likely that Emily is a mouse. It is likely that Lily is white. There is a very good chance that if either 'Emily is a mouse' or 'Julius is gray' but not both then Greg is a frog. We doubt that if either 'Lily is white' or 'Emily is a mouse' but not both then John discarded the milk. We believe that if 'Julius is gray' or 'Emily is a mouse' or both then Mary left the football.
hypothesis: There is a better than even chance that 'Emily is a mouse and Julius is gray'.
valid_hypothesis: There is a better than even chance that 'Emily is a mouse and Julius is gray'.
invalid_hypothesis: It is highly unlikely that 'Emily is a mouse and Julius is gray'.
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
    0.8::factA.
    0.7::factB.
    0.7::factC.
    %hop1
    0.8::factX:-xor(factB,factA).
    0.2::factY:-xor(factC,factB).
    0.75::factZ:-or(factA,factB).
  
    %hop2
    conclusion:-and(factB,factA).
  
    query(conclusion).
    
hypothesis_assertion: 'Emily is a mouse and Julius is gray'.