Chances are slight that Emily is a wolf. It is unlikely that Julius is a lion. There is almost no chance that Mary got the football. Chances are about even that if 'Mary got the football and Julius is a lion' then Brian is yellow. There is a very good chance that if either 'Emily is a wolf' or 'Julius is a lion' but not both then Gertrude is a cat. There is a very good chance that if 'Emily is a wolf' or 'Mary got the football' or both then Bernhard is green.
There is little chance that 'Mary got the football' or 'Emily is a wolf' or both.
There is little chance that 'Mary got the football' or 'Emily is a wolf' or both.
It is almost certain that 'Mary got the football' or 'Emily 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
  0.1::factA.
  0.2::factB.
  0.02::factC.
  %hop1
  0.5::factX:-and(factC,factB).
  0.8::factY:-xor(factA,factB).
  0.8::factZ:-or(factA,factC).

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

  query(conclusion).
  
'Mary got the football' or 'Emily is a wolf' or both.