It is probably the case that Bernhard is green. It is highly likely that Greg is a rhino. It is highly likely that Brian is gray. It is probable that if 'Bernhard is green' or 'Greg is a rhino' or both then Julius is yellow. We doubt that if 'Brian is gray' or 'Greg is a rhino' or both then Jessica is a cat. It is improbable that if 'Bernhard is green' or 'Greg is a rhino' or both then John moved to the office.
There is almost no chance that 'Jessica is a cat' or 'Brian is gray' or both.
It is highly likely that 'Jessica is a cat' or 'Brian is gray' or both.
There is almost no chance that 'Jessica is a cat' or 'Brian is gray' or both.

  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
  0.7::factA.
  0.9::factB.
  0.9::factC.
  %hop1
  0.7::factX:-or(factA,factB).
  0.2::factY:-or(factC,factB).
  0.1::factZ:-or(factA,factB).

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

  query(conclusion).
  
'Jessica is a cat' or 'Brian is gray' or both.