It is certain that Greg is a frog. There is almost no chance that Brian is a rhino. It is probable that John moved to the office. Chances are slight that if 'Brian is a rhino and Greg is a frog' then Julius is a lion. It is probably the case that if 'John moved to the office' or 'Greg is a frog' or both then Bernhard is white. We doubt that if 'Brian is a rhino and Greg is a frog' then Lily is green.
Chances are slight that 'Julius is a lion' or 'John moved to the office' or both.
It is probable that 'Julius is a lion' or 'John moved to the office' or both.
Chances are slight that 'Julius is a lion' or 'John moved to the office' 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.
  0.02::factB.
  0.7::factC.
  %hop1
  0.1::factX:-and(factB,factA).
  0.7::factY:-or(factC,factA).
  0.2::factZ:-and(factB,factA).

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

  query(conclusion).
  
'Julius is a lion' or 'John moved to the office' or both.