It is improbable that Mary left the milk. It is impossible that Jessica is a cat. We doubt that Brian is gray. It is certain that if 'Jessica is a cat' or 'Brian is gray' or both then John went to the garden. It is certain that if 'Jessica is a cat' or 'Brian is gray' or both then Julius is white. We doubt that if 'Jessica is a cat' or 'Mary left the milk' or both then Lily is green.
Chances are about even that 'Lily is green and Jessica is a cat'.
It is impossible that 'Lily is green and Jessica is a cat'.
Chances are about even that 'Lily is green and Jessica is a cat'.

  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.
  0.0::factB.
  0.2::factC.
  %hop1
  1.0::factX:-or(factB,factC).
  1.0::factY:-or(factB,factC).
  0.2::factZ:-or(factB,factA).

  %hop2
  conclusion:-and(factZ,factB).

  query(conclusion).
  
'Lily is green and Jessica is a cat'.