There is a better than even chance that Julius is a frog. It is highly likely that Brian is yellow. There is a better than even chance that Winona is a sheep. It is probably the case that if 'Winona is a sheep and Brian is yellow' then Antoine is bored. It is almost certain that if 'Winona is a sheep' or 'Brian is yellow' or both then Sandra dropped the milk. It is likely that if either 'Julius is a frog' or 'Brian is yellow' but not both then Greg is a rhino.
Chances are slight that either 'Brian is yellow' or 'Greg is a rhino' but not both.
It is probable that either 'Brian is yellow' or 'Greg is a rhino' but not both.
Chances are slight that either 'Brian is yellow' 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
  0.6::factA.
  0.9::factB.
  0.6::factC.
  %hop1
  0.7::factX:-and(factC,factB).
  0.95::factY:-or(factC,factB).
  0.7::factZ:-xor(factA,factB).

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

  query(conclusion).
  
Either 'Brian is yellow' or 'Greg is a rhino' but not both.