It is impossible that Julius is a lion. We doubt that Brian is a frog. It is almost certain that Jeff moved to the office. It is probable that if 'Brian is a frog and Jeff moved to the office' then John took the football. We believe that if 'Julius is a lion and Jeff moved to the office' then Bernhard is gray. It is unlikely that if either 'Julius is a lion' or 'Jeff moved to the office' but not both then Daniel grabbed the milk.
We doubt that 'Julius is a lion' or 'Daniel grabbed the milk' or both.
We doubt that 'Julius is a lion' or 'Daniel grabbed the milk' or both.
It is probable that 'Julius is a lion' or 'Daniel grabbed the milk' 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.
  0.2::factB.
  0.95::factC.
  %hop1
  0.7::factX:-and(factB,factC).
  0.75::factY:-and(factA,factC).
  0.2::factZ:-xor(factA,factC).

  %hop2
  conclusion:-or(factA,factZ).

  query(conclusion).
  
'Julius is a lion' or 'Daniel grabbed the milk' or both.