It is improbable that Bernhard is a lion. There is a very good chance that Lily is a rhino. It is almost certain that John put down the milk. We doubt that if 'Lily is a rhino and Bernhard is a lion' then Julius is a frog. It is highly unlikely that if 'John put down the milk' or 'Bernhard is a lion' or both then Mary left the apple. It is probable that if 'Bernhard is a lion' or 'John put down the milk' or both then Brian is yellow.
There is a very good chance that 'Bernhard is a lion and Lily is a rhino'.
Chances are slight that 'Bernhard is a lion and Lily is a rhino'.
There is a very good chance that 'Bernhard is a lion and Lily 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.
  0.8::factB.
  0.95::factC.
  %hop1
  0.2::factX:-and(factB,factA).
  0.05::factY:-or(factC,factA).
  0.7::factZ:-or(factA,factC).

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

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