It is highly unlikely that Julius is white. There is a better than even chance that Lily is a lion. There is a very good chance that Mary went to the office. It is almost certain that if 'Mary went to the office' or 'Lily is a lion' or both then Bernhard is white. It is highly unlikely that if 'Mary went to the office' or 'Lily is a lion' or both then Jeff left the football. It is unlikely that if 'Julius is white' or 'Mary went to the office' or both then John got the milk.
There is a very good chance that 'Bernhard is white and Julius is white'.
It is highly unlikely that 'Bernhard is white and Julius is white'.
There is a very good chance that 'Bernhard is white and Julius is white'.

  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
  0.05::factA.
  0.6::factB.
  0.8::factC.
  %hop1
  0.95::factX:-or(factC,factB).
  0.05::factY:-or(factC,factB).
  0.2::factZ:-or(factA,factC).

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

  query(conclusion).
  
'Bernhard is white and Julius is white'.