context: It is likely that John went to the bedroom. There is little chance that Julius is a frog. We believe that Lily is green. It is improbable that if 'Lily is green and John went to the bedroom' then Mary grabbed the milk. There is a very good chance that if either 'Julius is a frog' or 'Lily is green' but not both then Greg is a rhino. We doubt that if 'Julius is a frog and John went to the bedroom' then Yann is thirsty.
hypothesis: There is a better than even chance that 'Julius is a frog and Yann is thirsty'.
valid_hypothesis: There is almost no chance that 'Julius is a frog and Yann is thirsty'.
invalid_hypothesis: There is a better than even chance that 'Julius is a frog and Yann is thirsty'.
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.
    0.1::factB.
    0.75::factC.
    %hop1
    0.1::factX:-and(factC,factA).
    0.8::factY:-xor(factB,factC).
    0.2::factZ:-and(factB,factA).
  
    %hop2
    conclusion:-and(factB,factZ).
  
    query(conclusion).
    
hypothesis_assertion: 'Julius is a frog and Yann is thirsty'.