It is highly unlikely that Lily is a rhino. We doubt that Julius is gray. We doubt that John dropped the apple. We doubt that if 'Julius is gray and Lily is a rhino' then Bernhard is yellow. It is improbable that if 'Lily is a rhino and Julius is gray' then Fred left the apple. There is almost no chance that if 'John dropped the apple and Lily is a rhino' then Mary went to the hallway.
It is probably not the case that 'Lily is a rhino' or 'John dropped the apple' or both.
It is probably not the case that 'Lily is a rhino' or 'John dropped the apple' or both.
It is certain that 'Lily is a rhino' or 'John dropped the apple' 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
  0.05::factA.
  0.2::factB.
  0.2::factC.
  %hop1
  0.2::factX:-and(factB,factA).
  0.1::factY:-and(factA,factB).
  0.02::factZ:-and(factC,factA).

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

  query(conclusion).
  
'Lily is a rhino' or 'John dropped the apple' or both.