It is improbable that Jessica is a mouse. It is impossible that Lily is a rhino. It is certain that Sandra got the milk. There is a better than even chance that if 'Lily is a rhino' or 'Sandra got the milk' or both then Antoine is hungry. We doubt that if 'Sandra got the milk and Jessica is a mouse' then Julius is gray. It is highly likely that if 'Lily is a rhino' or 'Jessica is a mouse' or both then Greg is a swan.
There is a very good chance that 'Lily is a rhino and Sandra got the milk'.
It is impossible that 'Lily is a rhino and Sandra got the milk'.
There is a very good chance that 'Lily is a rhino and Sandra got the milk'.

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

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

  query(conclusion).
  
'Lily is a rhino and Sandra got the milk'.