There is little chance that Mary went to the garden. It is impossible that Lily is a lion. We doubt that John left the football. It is probable that if 'Lily is a lion and Mary went to the garden' then Brian is white. It is likely that if 'John left the football and Lily is a lion' then Jessica is a cat. It is certain that if 'John left the football' or 'Mary went to the garden' or both then Jason is thirsty.
There is a very good chance that 'Mary went to the garden' or 'Jessica is a cat' or both.
It is improbable that 'Mary went to the garden' or 'Jessica is a cat' or both.
There is a very good chance that 'Mary went to the garden' or 'Jessica is a cat' 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.
  0.0::factB.
  0.2::factC.
  %hop1
  0.7::factX:-and(factB,factA).
  0.7::factY:-and(factC,factB).
  1.0::factZ:-or(factC,factA).

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

  query(conclusion).
  
'Mary went to the garden' or 'Jessica is a cat' or both.