context: It is almost certain that Mary put down the milk. It is certain that Sandra got the milk. It is likely that John went to the garden.
hypothesis: It is probable that 'John went to the garden and Sandra got the milk'.
valid_hypothesis: It is probable that 'John went to the garden and Sandra got the milk'.
invalid_hypothesis: There is little chance that 'John went to the garden and Sandra got the milk'.
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
    0.95::factA.
    1.0::factB.
    0.7::factC.
    
  
    %hop2
    conclusion:-and(factC,factB).
  
    query(conclusion).
    
hypothesis_assertion: 'John went to the garden and Sandra got the milk'.