Chances are slight that Brian is a rhino. Chances are about even that Lily is gray. We doubt that Jessica is a cat. There is a better than even chance that if 'Lily is gray' or 'Jessica is a cat' or both then Daniel grabbed the apple. There is a better than even chance that if 'Lily is gray and Jessica is a cat' then Mary dropped the milk. It is unlikely that if 'Jessica is a cat' or 'Lily is gray' or both then John went to the kitchen.
It is probable that 'Daniel grabbed the apple and Brian is a rhino'.
It is highly unlikely that 'Daniel grabbed the apple and Brian is a rhino'.
It is probable that 'Daniel grabbed the apple and Brian is a rhino'.

  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.
  0.5::factB.
  0.2::factC.
  %hop1
  0.6::factX:-or(factB,factC).
  0.6::factY:-and(factB,factC).
  0.2::factZ:-or(factC,factB).

  %hop2
  conclusion:-and(factX,factA).

  query(conclusion).
  
'Daniel grabbed the apple and Brian is a rhino'.