It is almost certain that Julius is white. We believe that Greg is a rhino. It is likely that Lily is green. It is likely that if 'Lily is green' or 'Greg is a rhino' or both then Bernhard is a swan. It is impossible that if 'Julius is white and Greg is a rhino' then Daniel took the apple. It is almost certain that if 'Greg is a rhino and Julius is white' then Brian is a frog.
It is highly likely that 'Bernhard is a swan' or 'Greg is a rhino' or both.
It is highly likely that 'Bernhard is a swan' or 'Greg is a rhino' or both.
It is highly unlikely that 'Bernhard is a swan' or 'Greg is a rhino' 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.
  0.7::factC.
  %hop1
  0.7::factX:-or(factC,factB).
  0.0::factY:-and(factA,factB).
  0.95::factZ:-and(factB,factA).

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

  query(conclusion).
  
'Bernhard is a swan' or 'Greg is a rhino' or both.