It is impossible that Julius is a frog. It is likely that Greg is gray. It is probably the case that Gertrude is a sheep. It is almost certain that if 'Julius is a frog and Gertrude is a sheep' then Lily is a rhino. It is unlikely that if 'Greg is gray and Julius is a frog' then Bernhard is green. Chances are slight that if either 'Julius is a frog' or 'Gertrude is a sheep' but not both then Brian is a swan.
It is probably the case that 'Lily is a rhino' or 'Gertrude is a sheep' or both.
It is probably the case that 'Lily is a rhino' or 'Gertrude is a sheep' or both.
It is probably not the case that 'Lily is a rhino' or 'Gertrude is a sheep' 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
  0.0::factA.
  0.7::factB.
  0.7::factC.
  %hop1
  0.95::factX:-and(factA,factC).
  0.2::factY:-and(factB,factA).
  0.1::factZ:-xor(factA,factC).

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

  query(conclusion).
  
'Lily is a rhino' or 'Gertrude is a sheep' or both.