context: It is highly likely that Mary left the apple. It is unlikely that Greg is white. Chances are about even that Lily is a rhino.
hypothesis: It is probably the case that 'Mary left the apple and Greg is white'.
valid_hypothesis: It is unlikely that 'Mary left the apple and Greg is white'.
invalid_hypothesis: It is probably the case that 'Mary left the apple and Greg is white'.
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.
    0.5::factC.
    
  
    %hop2
    conclusion:-and(factA,factB).
  
    query(conclusion).
    
hypothesis_assertion: 'Mary left the apple and Greg is white'.