It is probably not the case that Julius is green. It is highly unlikely that Brian is white. It is improbable that Fred left the football. There is a better than even chance that if 'Brian is white' or 'Fred left the football' or both then Winona is a wolf. There is little chance that if 'Julius is green and Fred left the football' then John discarded the apple. There is a better than even chance that if either 'Fred left the football' or 'Brian is white' but not both then Lily is a rhino.
It is highly likely that 'Brian is white' or 'Winona is a wolf' or both.
Chances are slight that 'Brian is white' or 'Winona is a wolf' or both.
It is highly likely that 'Brian is white' or 'Winona 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
  0.25::factA.
  0.05::factB.
  0.1::factC.
  %hop1
  0.6::factX:-or(factB,factC).
  0.1::factY:-and(factA,factC).
  0.6::factZ:-xor(factC,factB).

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

  query(conclusion).
  
'Brian is white' or 'Winona is a wolf' or both.