There is almost no chance that Jason is tired. It is certain that Gertrude is a sheep. We believe that Bernhard is green. It is improbable that if 'Bernhard is green' or 'Gertrude is a sheep' or both then Jessica is a cat. Chances are slight that if 'Bernhard is green and Jason is tired' then Brian is white. It is almost certain that if 'Gertrude is a sheep' or 'Bernhard is green' or both then Mary left the apple.
There is little chance that 'Bernhard is green and Jessica is a cat'.
There is little chance that 'Bernhard is green and Jessica is a cat'.
It is probable that 'Bernhard is green and Jessica is a cat'.

  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
  0.02::factA.
  1.0::factB.
  0.75::factC.
  %hop1
  0.1::factX:-or(factC,factB).
  0.1::factY:-and(factC,factA).
  0.95::factZ:-or(factB,factC).

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

  query(conclusion).
  
'Bernhard is green and Jessica is a cat'.