It is improbable that Brian is white. It is improbable that Winona is a cat. It is probable that Emily is a mouse. It is almost certain that if 'Brian is white' or 'Winona is a cat' or both then Lily is white. It is highly likely that if 'Brian is white' or 'Winona is a cat' or both then John put down the apple. It is highly unlikely that if 'Emily is a mouse and Winona is a cat' then Greg is a lion.
It is unlikely that 'Lily is white' or 'Greg is a lion' or both.
It is unlikely that 'Lily is white' or 'Greg is a lion' or both.
It is almost certain that 'Lily is white' or 'Greg is a lion' 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
  0.1::factA.
  0.1::factB.
  0.7::factC.
  %hop1
  0.95::factX:-or(factA,factB).
  0.9::factY:-or(factA,factB).
  0.05::factZ:-and(factC,factB).

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

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