context: It is highly likely that Brian is a rhino. It is impossible that Lily is a swan. It is almost certain that Sumit is thirsty. We believe that if 'Sumit is thirsty' or 'Lily is a swan' or both then Julius is gray. It is impossible that if 'Sumit is thirsty' or 'Brian is a rhino' or both then Mary went to the hallway. It is highly likely that if 'Sumit is thirsty and Lily is a swan' then John took the football.
hypothesis: Chances are slight that 'Julius is gray and Sumit is thirsty'.
valid_hypothesis: It is probably the case that 'Julius is gray and Sumit is thirsty'.
invalid_hypothesis: Chances are slight that 'Julius is gray and Sumit is thirsty'.
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
    0.9::factA.
    0.0::factB.
    0.95::factC.
    %hop1
    0.75::factX:-or(factC,factB).
    0.0::factY:-or(factC,factA).
    0.9::factZ:-and(factC,factB).
  
    %hop2
    conclusion:-and(factX,factC).
  
    query(conclusion).
    
hypothesis_assertion: 'Julius is gray and Sumit is thirsty'.