There is little chance that John put down the apple. We doubt that Winona is a wolf. It is improbable that Greg is a rhino. It is probably not the case that if either 'John put down the apple' or 'Winona is a wolf' but not both then Lily is white. There is almost no chance that if either 'Winona is a wolf' or 'Greg is a rhino' but not both then Mary went to the garden. We believe that if 'John put down the apple' or 'Greg is a rhino' or both then Brian is yellow.
It is probably not the case that 'Greg is a rhino' or 'Winona is a wolf' or both.
It is probably not the case that 'Greg is a rhino' or 'Winona is a wolf' or both.
It is almost certain that 'Greg is a rhino' 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
  0.1::factA.
  0.2::factB.
  0.1::factC.
  %hop1
  0.25::factX:-xor(factA,factB).
  0.02::factY:-xor(factB,factC).
  0.75::factZ:-or(factA,factC).

  %hop2
  conclusion:-or(factC,factB).

  query(conclusion).
  
'Greg is a rhino' or 'Winona is a wolf' or both.