There is a better than even chance that Bernhard is a swan. It is improbable that Brian is yellow. Chances are about even that John put down the milk. We believe that if 'John put down the milk and Bernhard is a swan' then Jeff moved to the garden. It is unlikely that if either 'Bernhard is a swan' or 'Brian is yellow' but not both then Mary went to the hallway. We doubt that if either 'Brian is yellow' or 'Bernhard is a swan' but not both then Gertrude is a mouse.
It is almost certain that 'Bernhard is a swan and Jeff moved to the garden'.
It is probably not the case that 'Bernhard is a swan and Jeff moved to the garden'.
It is almost certain that 'Bernhard is a swan and Jeff moved to the garden'.

  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
  0.6::factA.
  0.1::factB.
  0.5::factC.
  %hop1
  0.75::factX:-and(factC,factA).
  0.2::factY:-xor(factA,factB).
  0.2::factZ:-xor(factB,factA).

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

  query(conclusion).
  
'Bernhard is a swan and Jeff moved to the garden'.