It is highly likely that Gertrude is a sheep. There is almost no chance that Greg is a lion. We believe that Julius is gray. It is unlikely that if either 'Julius is gray' or 'Greg is a lion' but not both then Lily is white. It is almost certain that if either 'Greg is a lion' or 'Julius is gray' but not both then Sandra left the football. It is improbable that if either 'Julius is gray' or 'Greg is a lion' but not both then John went to the bedroom.
There is a better than even chance that 'Lily is white and Greg is a lion'.
It is impossible that 'Lily is white and Greg is a lion'.
There is a better than even chance that 'Lily is white and Greg is a lion'.

  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.
  0.02::factB.
  0.75::factC.
  %hop1
  0.2::factX:-xor(factC,factB).
  0.95::factY:-xor(factB,factC).
  0.1::factZ:-xor(factC,factB).

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

  query(conclusion).
  
'Lily is white and Greg is a lion'.