context: Chances are slight that Mary went to the garden. Chances are slight that Sandra got the milk. It is impossible that Julius is white.
hypothesis: It is highly likely that 'Mary went to the garden and Julius is white'.
valid_hypothesis: It is impossible that 'Mary went to the garden and Julius is white'.
invalid_hypothesis: It is highly likely that 'Mary went to the garden and Julius 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.
    0.1::factB.
    0.0::factC.
    
  
    %hop2
    conclusion:-and(factA,factC).
  
    query(conclusion).
    
hypothesis_assertion: 'Mary went to the garden and Julius is white'.