context: It is almost certain that Greg is a lion. It is probably not the case that Mary went to the office. It is highly likely that Sandra got the football.
hypothesis: There is almost no chance that either 'Sandra got the football' or 'Mary went to the office' but not both.
valid_hypothesis: It is likely that either 'Sandra got the football' or 'Mary went to the office' but not both.
invalid_hypothesis: There is almost no chance that either 'Sandra got the football' or 'Mary went to the office' but not 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.
    0.25::factB.
    0.9::factC.
    
  
    %hop2
    conclusion:-xor(factC,factB).
  
    query(conclusion).
    
hypothesis_assertion: Either 'Sandra got the football' or 'Mary went to the office' but not both.