context: It is highly likely that Emily is a cat. We doubt that Lily is a rhino. There is a better than even chance that Mary went to the bedroom.
hypothesis: There is little chance that 'Mary went to the bedroom and Lily is a rhino'.
valid_hypothesis: There is little chance that 'Mary went to the bedroom and Lily is a rhino'.
invalid_hypothesis: We believe that 'Mary went to the bedroom 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
    0.9::factA.
    0.2::factB.
    0.6::factC.
    
  
    %hop2
    conclusion:-and(factC,factB).
  
    query(conclusion).
    
hypothesis_assertion: 'Mary went to the bedroom and Lily is a rhino'.