It is certain that Bernhard is a frog. There is almost no chance that Antoine is hungry. Chances are about even that Julius is a swan. There is almost no chance that if 'Bernhard is a frog and Antoine is hungry' then Mary went to the office. There is a better than even chance that if 'Julius is a swan' or 'Antoine is hungry' or both then Brian is yellow. There is almost no chance that if 'Bernhard is a frog and Antoine is hungry' then John picked up the milk.
It is probably not the case that 'Julius is a swan and Brian is yellow'.
It is probably not the case that 'Julius is a swan and Brian is yellow'.
It is likely that 'Julius is a swan and Brian is yellow'.

  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
  1.0::factA.
  0.02::factB.
  0.5::factC.
  %hop1
  0.02::factX:-and(factA,factB).
  0.6::factY:-or(factC,factB).
  0.02::factZ:-and(factA,factB).

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

  query(conclusion).
  
'Julius is a swan and Brian is yellow'.