There is a better than even chance that Antoine is hungry. It is unlikely that Bernhard is a frog. There is little chance that Emily is a sheep. It is impossible that if 'Bernhard is a frog and Antoine is hungry' then Lily is green. There is a very good chance that if 'Emily is a sheep' or 'Antoine is hungry' or both then Mary left the milk. We doubt that if 'Antoine is hungry' or 'Emily is a sheep' or both then Julius is a lion.
There is little chance that either 'Bernhard is a frog' or 'Antoine is hungry' but not both.
There is a better than even chance that either 'Bernhard is a frog' or 'Antoine is hungry' but not both.
There is little chance that either 'Bernhard is a frog' or 'Antoine is hungry' 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
  0.6::factA.
  0.2::factB.
  0.1::factC.
  %hop1
  0.0::factX:-and(factB,factA).
  0.8::factY:-or(factC,factA).
  0.2::factZ:-or(factA,factC).

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

  query(conclusion).
  
Either 'Bernhard is a frog' or 'Antoine is hungry' but not both.