It is almost certain that Julius is a swan. Chances are slight that Greg is a frog. There is little chance that Bill moved to the office. There is a very good chance that if 'Greg is a frog' or 'Julius is a swan' or both then John went to the bedroom. We believe that if 'Greg is a frog' or 'Julius is a swan' or both then Lily is yellow. We believe that if either 'Greg is a frog' or 'Bill moved to the office' but not both then Bernhard is green.
It is probably not the case that 'John went to the bedroom and Julius is a swan'.
We believe that 'John went to the bedroom and Julius is a swan'.
It is probably not the case that 'John went to the bedroom and Julius is a swan'.

  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
  0.95::factA.
  0.1::factB.
  0.1::factC.
  %hop1
  0.8::factX:-or(factB,factA).
  0.75::factY:-or(factB,factA).
  0.75::factZ:-xor(factB,factC).

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

  query(conclusion).
  
'John went to the bedroom and Julius is a swan'.