It is certain that Julius is a frog. It is probably not the case that Gertrude is a wolf. It is probable that Bernhard is white. It is certain that if 'Bernhard is white and Julius is a frog' then Winona is a sheep. It is certain that if 'Julius is a frog' or 'Gertrude is a wolf' or both then Greg is green. There is a very good chance that if 'Gertrude is a wolf' or 'Bernhard is white' or both then John left the milk.
It is certain that 'Greg is green' or 'Gertrude is a wolf' or both.
It is certain that 'Greg is green' or 'Gertrude is a wolf' or both.
It is improbable that 'Greg is green' or 'Gertrude is a wolf' 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
  1.0::factA.
  0.25::factB.
  0.7::factC.
  %hop1
  1.0::factX:-and(factC,factA).
  1.0::factY:-or(factA,factB).
  0.8::factZ:-or(factB,factC).

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

  query(conclusion).
  
'Greg is green' or 'Gertrude is a wolf' or both.