context: It is almost certain that Mary put down the apple. It is almost certain that Brian is yellow. It is probable that John took the football.
hypothesis: It is certain that 'Mary put down the apple' or 'Brian is yellow' or both.
valid_hypothesis: It is certain that 'Mary put down the apple' or 'Brian is yellow' or both.
invalid_hypothesis: Chances are slight that 'Mary put down the apple' or 'Brian is yellow' or both.
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.
    0.95::factB.
    0.7::factC.
    
  
    %hop2
    conclusion:-or(factA,factB).
  
    query(conclusion).
    
hypothesis_assertion: 'Mary put down the apple' or 'Brian is yellow' or both.