There is a better than even chance that Winona is a wolf. There is a very good chance that Jessica is a cat. It is probable that Brian is green. It is improbable that if either 'Jessica is a cat' or 'Brian is green' but not both then Lily is gray. It is probably not the case that if 'Winona is a wolf and Jessica is a cat' then Mary left the football. There is little chance that if 'Jessica is a cat' or 'Winona is a wolf' or both then Julius is a lion.
We doubt that 'Julius is a lion' or 'Mary left the football' or both.
We doubt that 'Julius is a lion' or 'Mary left the football' or both.
It is probably the case that 'Julius is a lion' or 'Mary left the football' 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
  0.6::factA.
  0.8::factB.
  0.7::factC.
  %hop1
  0.1::factX:-xor(factB,factC).
  0.25::factY:-and(factA,factB).
  0.1::factZ:-or(factB,factA).

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

  query(conclusion).
  
'Julius is a lion' or 'Mary left the football' or both.