It is highly likely that Winona is a sheep. It is almost certain that Bernhard is white. There is little chance that Brian is gray. It is probably not the case that if either 'Brian is gray' or 'Winona is a sheep' but not both then Sandra left the football. Chances are about even that if 'Bernhard is white' or 'Winona is a sheep' or both then Antoine is hungry. It is unlikely that if 'Bernhard is white and Winona is a sheep' then Julius is a rhino.
There is a better than even chance that 'Bernhard is white and Brian is gray'.
It is improbable that 'Bernhard is white and Brian is gray'.
There is a better than even chance that 'Bernhard is white and Brian is gray'.

  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
  0.9::factA.
  0.95::factB.
  0.1::factC.
  %hop1
  0.25::factX:-xor(factC,factA).
  0.5::factY:-or(factB,factA).
  0.2::factZ:-and(factB,factA).

  %hop2
  conclusion:-and(factB,factC).

  query(conclusion).
  
'Bernhard is white and Brian is gray'.