context: There is almost no chance that John discarded the apple. It is probably the case that Mary went to the kitchen. It is highly likely that Greg is green.
hypothesis: It is probably the case that 'Greg is green and John discarded the apple'.
valid_hypothesis: There is almost no chance that 'Greg is green and John discarded the apple'.
invalid_hypothesis: It is probably the case that 'Greg is green and John discarded the apple'.
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
    0.02::factA.
    0.7::factB.
    0.9::factC.
    
  
    %hop2
    conclusion:-and(factC,factA).
  
    query(conclusion).
    
hypothesis_assertion: 'Greg is green and John discarded the apple'.