It is improbable that Sandra grabbed the apple. We doubt that Greg is a lion. It is probable that Julius is a rhino. It is probably the case that if either 'Greg is a lion' or 'Sandra grabbed the apple' but not both then Emily is a wolf. It is improbable that if 'Greg is a lion' or 'Sandra grabbed the apple' or both then Brian is green. We doubt that if 'Greg is a lion' or 'Sandra grabbed the apple' or both then Mary left the football.
It is unlikely that either 'Emily is a wolf' or 'Brian is green' but not both.
It is unlikely that either 'Emily is a wolf' or 'Brian is green' but not both.
It is probably the case that either 'Emily is a wolf' or 'Brian is green' but not 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.
  0.7::factC.
  %hop1
  0.7::factX:-xor(factB,factA).
  0.1::factY:-or(factB,factA).
  0.2::factZ:-or(factB,factA).

  %hop2
  conclusion:-xor(factX,factY).

  query(conclusion).
  
Either 'Emily is a wolf' or 'Brian is green' but not both.