It is almost certain that Brian is white. It is improbable that Lily is a rhino. It is probably not the case that Greg is gray. It is certain that if 'Lily is a rhino' or 'Greg is gray' or both then Mary left the apple. We doubt that if either 'Greg is gray' or 'Lily is a rhino' but not both then Julius is a swan. It is likely that if 'Lily is a rhino' or 'Greg is gray' or both then Daniel dropped the milk.
Chances are slight that 'Lily is a rhino' or 'Brian is white' or both.
It is almost certain that 'Lily is a rhino' or 'Brian is white' or both.
Chances are slight that 'Lily is a rhino' or 'Brian is white' 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
  0.95::factA.
  0.1::factB.
  0.25::factC.
  %hop1
  1.0::factX:-or(factB,factC).
  0.2::factY:-xor(factC,factB).
  0.7::factZ:-or(factB,factC).

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

  query(conclusion).
  
'Lily is a rhino' or 'Brian is white' or both.