context: It is highly likely that Daniel grabbed the apple. It is almost certain that Brian is a frog. It is highly likely that Emily is a wolf. We believe that if 'Emily is a wolf' or 'Brian is a frog' or both then Sandra is in the kitchen. It is certain that if 'Brian is a frog and Daniel grabbed the apple' then John dropped the milk. It is almost certain that if 'Daniel grabbed the apple' or 'Brian is a frog' or both then Bernhard is a lion.
hypothesis: It is probably not the case that 'John dropped the milk and Daniel grabbed the apple'.
valid_hypothesis: It is highly likely that 'John dropped the milk and Daniel grabbed the apple'.
invalid_hypothesis: It is probably not the case that 'John dropped the milk and Daniel grabbed the apple'.
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
    0.9::factA.
    0.95::factB.
    0.9::factC.
    %hop1
    0.75::factX:-or(factC,factB).
    1.0::factY:-and(factB,factA).
    0.95::factZ:-or(factA,factB).
  
    %hop2
    conclusion:-and(factY,factA).
  
    query(conclusion).
    
hypothesis_assertion: 'John dropped the milk and Daniel grabbed the apple'.