context: It is probably the case that Mary took the football. It is highly unlikely that Daniel got the milk. It is unlikely that Lily is a lion. There is almost no chance that if 'Lily is a lion' or 'Daniel got the milk' or both then Jason is tired. It is almost certain that if 'Daniel got the milk' or 'Mary took the football' or both then Brian is a swan. It is improbable that if 'Daniel got the milk' or 'Mary took the football' or both then John went to the hallway.
hypothesis: It is probably not the case that 'Mary took the football' or 'Daniel got the milk' or both.
valid_hypothesis: It is probably the case that 'Mary took the football' or 'Daniel got the milk' or both.
invalid_hypothesis: It is probably not the case that 'Mary took the football' or 'Daniel got the milk' 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
    0.7::factA.
    0.05::factB.
    0.2::factC.
    %hop1
    0.02::factX:-or(factC,factB).
    0.95::factY:-or(factB,factA).
    0.1::factZ:-or(factB,factA).
  
    %hop2
    conclusion:-or(factA,factB).
  
    query(conclusion).
    
hypothesis_assertion: 'Mary took the football' or 'Daniel got the milk' or both.