It is highly unlikely that Gertrude is a wolf. Chances are slight that Jessica is a mouse. It is certain that Bernhard is white. It is highly unlikely that if 'Jessica is a mouse' or 'Bernhard is white' or both then Julius is green. We believe that if either 'Jessica is a mouse' or 'Bernhard is white' but not both then Lily is a lion. It is probably not the case that if either 'Jessica is a mouse' or 'Bernhard is white' but not both then Brian is a frog.
It is probably not the case that 'Lily is a lion and Bernhard is white'.
It is likely that 'Lily is a lion and Bernhard is white'.
It is probably not the case that 'Lily is a lion and Bernhard 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.
  0.1::factB.
  1.0::factC.
  %hop1
  0.05::factX:-or(factB,factC).
  0.75::factY:-xor(factB,factC).
  0.25::factZ:-xor(factB,factC).

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

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