There is a very good chance that Bernhard is a rhino. It is probable that Jessica is a wolf. There is a better than even chance that Sandra dropped the milk. Chances are slight that if 'Bernhard is a rhino and Jessica is a wolf' then Brian is yellow. It is probably not the case that if 'Sandra dropped the milk' or 'Jessica is a wolf' or both then Mary went to the bedroom. Chances are slight that if 'Jessica is a wolf' or 'Sandra dropped the milk' or both then Julius is white.
There is a better than even chance that 'Julius is white and Jessica is a wolf'.
It is highly unlikely that 'Julius is white and Jessica is a wolf'.
There is a better than even chance that 'Julius is white and Jessica is a wolf'.

  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
  0.8::factA.
  0.7::factB.
  0.6::factC.
  %hop1
  0.1::factX:-and(factA,factB).
  0.25::factY:-or(factC,factB).
  0.1::factZ:-or(factB,factC).

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

  query(conclusion).
  
'Julius is white and Jessica is a wolf'.