It is almost certain that Lily is a swan. It is almost certain that Mary went to the kitchen. It is probably the case that Brian is gray. We doubt that if 'Brian is gray and Lily is a swan' then Greg is yellow. It is unlikely that if 'Lily is a swan' or 'Mary went to the kitchen' or both then Julius is white. It is almost certain that if 'Lily is a swan' or 'Brian is gray' or both then Sandra got the milk.
It is almost certain that 'Julius is white' or 'Lily is a swan' or both.
It is almost certain that 'Julius is white' or 'Lily is a swan' or both.
There is almost no chance that 'Julius is white' or 'Lily is a swan' 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.
  0.95::factB.
  0.7::factC.
  %hop1
  0.2::factX:-and(factC,factA).
  0.2::factY:-or(factA,factB).
  0.95::factZ:-or(factA,factC).

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

  query(conclusion).
  
'Julius is white' or 'Lily is a swan' or both.