Chances are slight that Lily is a frog. We doubt that Brian is yellow. It is probably not the case that Mary went to the garden. We believe that if 'Lily is a frog and Brian is yellow' then Julius is gray. It is certain that if 'Brian is yellow and Mary went to the garden' then Daniel took the milk. There is a better than even chance that if 'Lily is a frog' or 'Brian is yellow' or both then Sandra left the milk.
It is probably not the case that 'Lily is a frog' or 'Mary went to the garden' or both.
It is probably not the case that 'Lily is a frog' or 'Mary went to the garden' or both.
It is almost certain that 'Lily is a frog' or 'Mary went to the garden' 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.
  0.2::factB.
  0.25::factC.
  %hop1
  0.75::factX:-and(factA,factB).
  1.0::factY:-and(factB,factC).
  0.6::factZ:-or(factA,factB).

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

  query(conclusion).
  
'Lily is a frog' or 'Mary went to the garden' or both.