It is unlikely that Winona is a wolf. It is impossible that Daniel got the milk. There is a better than even chance that Bill moved to the office. It is probably the case that if 'Winona is a wolf' or 'Daniel got the milk' or both then Bernhard is a rhino. It is probable that if 'Bill moved to the office and Winona is a wolf' then John went to the kitchen. There is almost no chance that if either 'Daniel got the milk' or 'Winona is a wolf' but not both then Mary discarded the milk.
We doubt that 'Winona is a wolf' or 'Daniel got the milk' or both.
We doubt that 'Winona is a wolf' or 'Daniel got the milk' or both.
It is certain that 'Winona is a wolf' or 'Daniel got the milk' 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
  0.2::factA.
  0.0::factB.
  0.6::factC.
  %hop1
  0.7::factX:-or(factA,factB).
  0.7::factY:-and(factC,factA).
  0.02::factZ:-xor(factB,factA).

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

  query(conclusion).
  
'Winona is a wolf' or 'Daniel got the milk' or both.