context: There is little chance that Lily is white. It is highly likely that Mary left the apple. There is almost no chance that Bernhard is a swan.
hypothesis: There is little chance that 'Mary left the apple and Lily is white'.
valid_hypothesis: There is little chance that 'Mary left the apple and Lily is white'.
invalid_hypothesis: It is probable that 'Mary left the apple and Lily 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
    0.1::factA.
    0.9::factB.
    0.02::factC.
    
  
    %hop2
    conclusion:-and(factB,factA).
  
    query(conclusion).
    
hypothesis_assertion: 'Mary left the apple and Lily is white'.