context: We believe that Mary went to the office. There is a better than even chance that Jessica is a cat. It is probably the case that Greg is a lion.
hypothesis: It is probably not the case that 'Jessica is a cat' or 'Mary went to the office' or both.
valid_hypothesis: It is highly likely that 'Jessica is a cat' or 'Mary went to the office' or both.
invalid_hypothesis: It is probably not the case that 'Jessica is a cat' or 'Mary went to the office' 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
    0.75::factA.
    0.6::factB.
    0.7::factC.
    
  
    %hop2
    conclusion:-or(factB,factA).
  
    query(conclusion).
    
hypothesis_assertion: 'Jessica is a cat' or 'Mary went to the office' or both.