context: It is highly unlikely that Julius is a frog. We doubt that Brian is a lion. We doubt that Mary moved to the garden. It is highly likely that if 'Julius is a frog and Mary moved to the garden' then John dropped the milk. It is certain that if 'Julius is a frog and Mary moved to the garden' then Sumit is thirsty. We doubt that if 'Mary moved to the garden and Brian is a lion' then Lily is green.
hypothesis: It is certain that 'Brian is a lion' or 'Lily is green' or both.
valid_hypothesis: It is unlikely that 'Brian is a lion' or 'Lily is green' or both.
invalid_hypothesis: It is certain that 'Brian is a lion' or 'Lily is green' 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
    0.05::factA.
    0.2::factB.
    0.2::factC.
    %hop1
    0.9::factX:-and(factA,factC).
    1.0::factY:-and(factA,factC).
    0.2::factZ:-and(factC,factB).
  
    %hop2
    conclusion:-or(factB,factZ).
  
    query(conclusion).
    
hypothesis_assertion: 'Brian is a lion' or 'Lily is green' or both.