It is highly unlikely that Daniel took the milk. There is a better than even chance that Jason is tired. We believe that Brian is a swan. It is unlikely that if 'Brian is a swan' or 'Daniel took the milk' or both then Jessica is a mouse. We believe that if 'Jason is tired and Brian is a swan' then Lily is white. It is impossible that if 'Daniel took the milk and Jason is tired' then John went to the garden.
We doubt that 'Jessica is a mouse' or 'John went to the garden' or both.
We doubt that 'Jessica is a mouse' or 'John went to the garden' or both.
There is a very good chance that 'Jessica is a mouse' or 'John went to the garden' 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
  0.05::factA.
  0.6::factB.
  0.75::factC.
  %hop1
  0.2::factX:-or(factC,factA).
  0.75::factY:-and(factB,factC).
  0.0::factZ:-and(factA,factB).

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

  query(conclusion).
  
'Jessica is a mouse' or 'John went to the garden' or both.