It is impossible that Julius is a lion. It is certain that Jessica is a mouse. There is little chance that Bernhard is a swan. It is probably not the case that if 'Bernhard is a swan' or 'Jessica is a mouse' or both then Mary dropped the milk. It is unlikely that if 'Jessica is a mouse' or 'Bernhard is a swan' or both then Lily is a rhino. There is a very good chance that if either 'Bernhard is a swan' or 'Julius is a lion' but not both then John went to the garden.
It is probably the case that 'Lily is a rhino and Bernhard is a swan'.
There is almost no chance that 'Lily is a rhino and Bernhard is a swan'.
It is probably the case that 'Lily is a rhino and Bernhard is a swan'.

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

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

  query(conclusion).
  
'Lily is a rhino and Bernhard is a swan'.