There is little chance that Brian is a rhino. We believe that Lily is a lion. Chances are about even that Bernhard is gray. There is a very good chance that if 'Lily is a lion' or 'Bernhard is gray' or both then John moved to the office. It is unlikely that if 'Bernhard is gray' or 'Lily is a lion' or both then Julius is yellow. Chances are about even that if 'Lily is a lion' or 'Brian is a rhino' or both then Sandra took the milk.
It is almost certain that 'Lily is a lion and Bernhard is gray'.
It is probably not the case that 'Lily is a lion and Bernhard is gray'.
It is almost certain that 'Lily is a lion and Bernhard is gray'.

  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.
  0.75::factB.
  0.5::factC.
  %hop1
  0.8::factX:-or(factB,factC).
  0.2::factY:-or(factC,factB).
  0.5::factZ:-or(factB,factA).

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

  query(conclusion).
  
'Lily is a lion and Bernhard is gray'.