We doubt that Winona is a sheep. It is probably not the case that Greg is a rhino. It is impossible that Bernhard is a lion. It is highly unlikely that if 'Winona is a sheep and Greg is a rhino' then Sumit is hungry. It is improbable that if 'Winona is a sheep' or 'Bernhard is a lion' or both then Julius is a frog. It is unlikely that if 'Bernhard is a lion and Winona is a sheep' then Mary left the football.
It is highly likely that either 'Julius is a frog' or 'Greg is a rhino' but not both.
It is probably not the case that either 'Julius is a frog' or 'Greg is a rhino' but not both.
It is highly likely that either 'Julius is a frog' or 'Greg is a rhino' 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
  0.2::factA.
  0.25::factB.
  0.0::factC.
  %hop1
  0.05::factX:-and(factA,factB).
  0.1::factY:-or(factA,factC).
  0.2::factZ:-and(factC,factA).

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

  query(conclusion).
  
Either 'Julius is a frog' or 'Greg is a rhino' but not both.