It is highly likely that Winona is a wolf. There is a better than even chance that Lily is green. We doubt that Mary left the football. It is probable that if either 'Mary left the football' or 'Winona is a wolf' but not both then Bernhard is a frog. It is almost certain that if either 'Winona is a wolf' or 'Mary left the football' but not both then John grabbed the apple. It is likely that if either 'Winona is a wolf' or 'Mary left the football' but not both then Brian is white.
It is highly unlikely that 'Brian is white and Winona is a wolf'.
Chances are about even that 'Brian is white and Winona is a wolf'.
It is highly unlikely that 'Brian is white and Winona is a wolf'.

  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
  0.9::factA.
  0.6::factB.
  0.2::factC.
  %hop1
  0.7::factX:-xor(factC,factA).
  0.95::factY:-xor(factA,factC).
  0.7::factZ:-xor(factA,factC).

  %hop2
  conclusion:-and(factZ,factA).

  query(conclusion).
  
'Brian is white and Winona is a wolf'.