It is impossible that Julius is green. It is probably not the case that Greg is a lion. It is improbable that Brian is white. There is a better than even chance that if 'Brian is white and Greg is a lion' then Fred went to the garden. Chances are slight that if either 'Julius is green' or 'Greg is a lion' but not both then Mary left the football. It is impossible that if either 'Julius is green' or 'Greg is a lion' but not both then Jessica is a mouse.
It is probably not the case that 'Greg is a lion' or 'Julius is green' or both.
It is probably not the case that 'Greg is a lion' or 'Julius is green' or both.
We believe that 'Greg is a lion' or 'Julius is green' 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.
  0.25::factB.
  0.1::factC.
  %hop1
  0.6::factX:-and(factC,factB).
  0.1::factY:-xor(factA,factB).
  0.0::factZ:-xor(factA,factB).

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

  query(conclusion).
  
'Greg is a lion' or 'Julius is green' or both.