It is probably the case that John discarded the milk. Chances are slight that Greg is green. It is probably not the case that Emily is a wolf. There is a very good chance that if either 'Emily is a wolf' or 'Greg is green' but not both then Julius is white. There is almost no chance that if 'Emily is a wolf and John discarded the milk' then Bernhard is a swan. It is impossible that if 'John discarded the milk and Greg is green' then Mary got the football.
It is probably not the case that 'Emily is a wolf' or 'Julius is white' or both.
It is probably not the case that 'Emily is a wolf' or 'Julius is white' or both.
It is probably the case that 'Emily is a wolf' or 'Julius is white' 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
  0.7::factA.
  0.1::factB.
  0.25::factC.
  %hop1
  0.8::factX:-xor(factC,factB).
  0.02::factY:-and(factC,factA).
  0.0::factZ:-and(factA,factB).

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

  query(conclusion).
  
'Emily is a wolf' or 'Julius is white' or both.