context: There is a better than even chance that Sumit is thirsty. It is highly likely that Lily is a frog. It is impossible that Brian is a rhino. It is probably the case that if either 'Brian is a rhino' or 'Sumit is thirsty' but not both then Greg is a lion. It is highly likely that if 'Sumit is thirsty and Brian is a rhino' then John went to the office. It is improbable that if 'Lily is a frog and Brian is a rhino' then Julius is white.
hypothesis: It is impossible that 'Julius is white and Brian is a rhino'.
valid_hypothesis: It is impossible that 'Julius is white and Brian is a rhino'.
invalid_hypothesis: It is certain that 'Julius is white and Brian is a rhino'.
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
    0.6::factA.
    0.9::factB.
    0.0::factC.
    %hop1
    0.7::factX:-xor(factC,factA).
    0.9::factY:-and(factA,factC).
    0.1::factZ:-and(factB,factC).
  
    %hop2
    conclusion:-and(factZ,factC).
  
    query(conclusion).
    
hypothesis_assertion: 'Julius is white and Brian is a rhino'.