It is almost certain that Jeff went to the garden. It is unlikely that Gertrude is a mouse. It is likely that Greg is a rhino. It is probable that if 'Greg is a rhino' or 'Gertrude is a mouse' or both then Bernhard is green. There is a very good chance that if 'Gertrude is a mouse' or 'Greg is a rhino' or both then Lily is a swan. It is certain that if 'Greg is a rhino' or 'Gertrude is a mouse' or both then Winona is a sheep.
Chances are slight that 'Bernhard is green' or 'Greg is a rhino' or both.
We believe that 'Bernhard is green' or 'Greg is a rhino' or both.
Chances are slight that 'Bernhard is green' 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.
  0.2::factB.
  0.7::factC.
  %hop1
  0.7::factX:-or(factC,factB).
  0.8::factY:-or(factB,factC).
  1.0::factZ:-or(factC,factB).

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

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