It is probably not the case that Bernhard is a rhino. We doubt that Julius is a swan. Chances are about even that Mary went to the garden. It is likely that if either 'Bernhard is a rhino' or 'Mary went to the garden' but not both then Bill moved to the office. It is highly likely that if 'Bernhard is a rhino' or 'Julius is a swan' or both then Lily is green. It is highly likely that if 'Julius is a swan' or 'Bernhard is a rhino' or both then John discarded the apple.
It is likely that 'John discarded the apple and Bernhard is a rhino'.
It is probably not the case that 'John discarded the apple and Bernhard is a rhino'.
It is likely that 'John discarded the apple and Bernhard is a rhino'.

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

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

  query(conclusion).
  
'John discarded the apple and Bernhard is a rhino'.