There is a very good chance that Brian is a rhino. It is probably the case that Bernhard is white. It is highly likely that Winona is a mouse. It is unlikely that if 'Brian is a rhino' or 'Winona is a mouse' or both then Greg is a swan. We doubt that if either 'Winona is a mouse' or 'Bernhard is white' but not both then Mary went to the bedroom. It is almost certain that if either 'Brian is a rhino' or 'Winona is a mouse' but not both then Lily is a frog.
It is likely that 'Mary went to the bedroom' or 'Lily is a frog' or both.
It is probably not the case that 'Mary went to the bedroom' or 'Lily is a frog' or both.
It is likely that 'Mary went to the bedroom' or 'Lily is a frog' 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
  0.8::factA.
  0.7::factB.
  0.9::factC.
  %hop1
  0.2::factX:-or(factA,factC).
  0.2::factY:-xor(factC,factB).
  0.95::factZ:-xor(factA,factC).

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

  query(conclusion).
  
'Mary went to the bedroom' or 'Lily is a frog' or both.