We believe that Brian is a frog. It is highly likely that Winona is a sheep. It is improbable that Mary got the milk. It is certain that if 'Winona is a sheep and Brian is a frog' then Jessica is a mouse. It is unlikely that if 'Mary got the milk' or 'Brian is a frog' or both then John went to the garden. Chances are slight that if either 'Winona is a sheep' or 'Mary got the milk' but not both then Julius is green.
It is unlikely that 'Winona is a sheep' or 'Jessica is a mouse' or both.
It is highly likely that 'Winona is a sheep' or 'Jessica is a mouse' or both.
It is unlikely that 'Winona is a sheep' or 'Jessica is a mouse' 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
  0.75::factA.
  0.9::factB.
  0.1::factC.
  %hop1
  1.0::factX:-and(factB,factA).
  0.2::factY:-or(factC,factA).
  0.1::factZ:-xor(factB,factC).

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

  query(conclusion).
  
'Winona is a sheep' or 'Jessica is a mouse' or both.