context: We believe that John got the football. We doubt that Daniel took the apple. It is impossible that Winona is a wolf. It is probably the case that if 'Winona is a wolf and Daniel took the apple' then Fred moved to the office. It is unlikely that if 'Daniel took the apple and John got the football' then Julius is a frog. There is little chance that if 'Winona is a wolf and John got the football' then Lily is a rhino.
hypothesis: It is impossible that 'Julius is a frog and Lily is a rhino'.
valid_hypothesis: It is impossible that 'Julius is a frog and Lily is a rhino'.
invalid_hypothesis: It is highly likely that 'Julius is a frog and Lily is a rhino'.
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
    0.75::factA.
    0.2::factB.
    0.0::factC.
    %hop1
    0.7::factX:-and(factC,factB).
    0.2::factY:-and(factB,factA).
    0.1::factZ:-and(factC,factA).
  
    %hop2
    conclusion:-and(factY,factZ).
  
    query(conclusion).
    
hypothesis_assertion: 'Julius is a frog and Lily is a rhino'.