context: It is improbable that Mary put down the apple. Chances are about even that Brian is a lion. It is probably the case that Daniel took the apple.
hypothesis: It is likely that 'Mary put down the apple and Brian is a lion'.
valid_hypothesis: It is highly unlikely that 'Mary put down the apple and Brian is a lion'.
invalid_hypothesis: It is likely that 'Mary put down the apple and Brian is a lion'.
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
    0.1::factA.
    0.5::factB.
    0.7::factC.
    
  
    %hop2
    conclusion:-and(factA,factB).
  
    query(conclusion).
    
hypothesis_assertion: 'Mary put down the apple and Brian is a lion'.