context: We believe that Mary dropped the apple. It is certain that Lily is green. There is little chance that Jason is tired.
hypothesis: There is a better than even chance that 'Jason is tired and Mary dropped the apple'.
valid_hypothesis: Chances are slight that 'Jason is tired and Mary dropped the apple'.
invalid_hypothesis: There is a better than even chance that 'Jason is tired and Mary dropped 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
    0.75::factA.
    1.0::factB.
    0.1::factC.
    
  
    %hop2
    conclusion:-and(factC,factA).
  
    query(conclusion).
    
hypothesis_assertion: 'Jason is tired and Mary dropped the apple'.