It is highly likely that Winona is a sheep. There is a very good chance that Greg is a lion. It is certain that Mary moved to the garden. It is certain that if 'Mary moved to the garden and Greg is a lion' then Lily is white. There is a better than even chance that if either 'Mary moved to the garden' or 'Greg is a lion' but not both then Bill went to the bedroom. There is a very good chance that if either 'Winona is a sheep' or 'Greg is a lion' but not both then Julius is a frog.
It is highly unlikely that 'Winona is a sheep' or 'Greg is a lion' or both.
It is certain that 'Winona is a sheep' or 'Greg is a lion' or both.
It is highly unlikely that 'Winona is a sheep' or 'Greg is a lion' 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.
  0.8::factB.
  1.0::factC.
  %hop1
  1.0::factX:-and(factC,factB).
  0.6::factY:-xor(factC,factB).
  0.8::factZ:-xor(factA,factB).

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

  query(conclusion).
  
'Winona is a sheep' or 'Greg is a lion' or both.