There is almost no chance that Winona is a wolf. We believe that Gertrude is a cat. There is a better than even chance that Lily is green. It is certain that if 'Gertrude is a cat' or 'Lily is green' or both then Julius is a swan. It is certain that if 'Gertrude is a cat' or 'Lily is green' or both then John grabbed the apple. It is likely that if 'Lily is green and Gertrude is a cat' then Mary went to the hallway.
It is impossible that 'John grabbed the apple' or 'Winona is a wolf' or both.
It is highly likely that 'John grabbed the apple' or 'Winona is a wolf' or both.
It is impossible that 'John grabbed the apple' or 'Winona is a wolf' or both.

  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
  0.02::factA.
  0.75::factB.
  0.6::factC.
  %hop1
  1.0::factX:-or(factB,factC).
  1.0::factY:-or(factB,factC).
  0.7::factZ:-and(factC,factB).

  %hop2
  conclusion:-or(factY,factA).

  query(conclusion).
  
'John grabbed the apple' or 'Winona is a wolf' or both.