There is a better than even chance that Greg is a lion. It is probable that Lily is green. Chances are about even that John went to the garden. It is probable that if 'Greg is a lion' or 'Lily is green' or both then Winona is a sheep. It is unlikely that if either 'John went to the garden' or 'Greg is a lion' but not both then Julius is a swan. It is unlikely that if 'John went to the garden' or 'Lily is green' or both then Brian is yellow.
There is a very good chance that 'Winona is a sheep' or 'John went to the garden' or both.
There is a very good chance that 'Winona is a sheep' or 'John went to the garden' or both.
It is probably not the case that 'Winona is a sheep' or 'John 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
  0.6::factA.
  0.7::factB.
  0.5::factC.
  %hop1
  0.7::factX:-or(factA,factB).
  0.2::factY:-xor(factC,factA).
  0.2::factZ:-or(factC,factB).

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

  query(conclusion).
  
'Winona is a sheep' or 'John went to the garden' or both.