We doubt that Lily is white. It is impossible that Emily is a sheep. It is certain that Bernhard is gray. There is a very good chance that if 'Bernhard is gray and Emily is a sheep' then John moved to the office. We believe that if 'Emily is a sheep and Bernhard is gray' then Bill went to the garden. It is probably the case that if 'Bernhard is gray' or 'Lily is white' or both then Julius is a rhino.
It is highly unlikely that 'Julius is a rhino' or 'Bill went to the garden' or both.
It is probably the case that 'Julius is a rhino' or 'Bill went to the garden' or both.
It is highly unlikely that 'Julius is a rhino' or 'Bill went to the garden' 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
  0.2::factA.
  0.0::factB.
  1.0::factC.
  %hop1
  0.8::factX:-and(factC,factB).
  0.75::factY:-and(factB,factC).
  0.7::factZ:-or(factC,factA).

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

  query(conclusion).
  
'Julius is a rhino' or 'Bill went to the garden' or both.