It is highly likely that Bernhard is a frog. It is improbable that Emily is a wolf. It is likely that John went to the bedroom. It is probably the case that if 'Bernhard is a frog and John went to the bedroom' then Brian is a rhino. It is certain that if either 'Bernhard is a frog' or 'Emily is a wolf' but not both then Mary dropped the apple. It is probable that if either 'Bernhard is a frog' or 'John went to the bedroom' but not both then Lily is yellow.
It is highly unlikely that 'Bernhard is a frog' or 'John went to the bedroom' or both.
It is almost certain that 'Bernhard is a frog' or 'John went to the bedroom' or both.
It is highly unlikely that 'Bernhard is a frog' or 'John went to the bedroom' 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
  0.9::factA.
  0.1::factB.
  0.7::factC.
  %hop1
  0.7::factX:-and(factA,factC).
  1.0::factY:-xor(factA,factB).
  0.7::factZ:-xor(factA,factC).

  %hop2
  conclusion:-or(factA,factC).

  query(conclusion).
  
'Bernhard is a frog' or 'John went to the bedroom' or both.