It is improbable that Greg is gray. It is improbable that Emily is a wolf. There is little chance that John left the milk. It is improbable that if 'Greg is gray and Emily is a wolf' then Julius is white. It is likely that if either 'Greg is gray' or 'Emily is a wolf' but not both then Bernhard is a swan. There is little chance that if 'Greg is gray and Emily is a wolf' then Antoine is hungry.
Chances are slight that 'Emily is a wolf' or 'Antoine is hungry' or both.
Chances are slight that 'Emily is a wolf' or 'Antoine is hungry' or both.
It is probable that 'Emily is a wolf' or 'Antoine is hungry' 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.
  0.1::factB.
  0.1::factC.
  %hop1
  0.1::factX:-and(factA,factB).
  0.7::factY:-xor(factA,factB).
  0.1::factZ:-and(factA,factB).

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

  query(conclusion).
  
'Emily is a wolf' or 'Antoine is hungry' or both.