It is almost certain that Jeff left the apple. We believe that Julius is a swan. It is almost certain that Yann is tired. It is probably not the case that if 'Yann is tired' or 'Julius is a swan' or both then Greg is gray. It is almost certain that if 'Jeff left the apple' or 'Yann is tired' or both then Brian is green. There is a better than even chance that if either 'Yann is tired' or 'Julius is a swan' but not both then Lily is a frog.
It is certain that 'Brian is green' or 'Julius is a swan' or both.
It is certain that 'Brian is green' or 'Julius is a swan' or both.
It is unlikely that 'Brian is green' or 'Julius 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.
  0.75::factB.
  0.95::factC.
  %hop1
  0.25::factX:-or(factC,factB).
  0.95::factY:-or(factA,factC).
  0.6::factZ:-xor(factC,factB).

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

  query(conclusion).
  
'Brian is green' or 'Julius is a swan' or both.