It is highly likely that Emily is a sheep. It is probably the case that Lily is a frog. It is unlikely that Julius is white. It is certain that if 'Julius is white and Lily is a frog' then Greg is a rhino. It is probably the case that if 'Lily is a frog' or 'Emily is a sheep' or both then Brian is white. There is almost no chance that if 'Emily is a sheep' or 'Lily is a frog' or both then Mary went to the bedroom.
It is probably not the case that either 'Emily is a sheep' or 'Lily is a frog' but not both.
It is probably not the case that either 'Emily is a sheep' or 'Lily is a frog' but not both.
It is probable that either 'Emily is a sheep' or 'Lily is a frog' but not 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.
  0.7::factB.
  0.2::factC.
  %hop1
  1.0::factX:-and(factC,factB).
  0.7::factY:-or(factB,factA).
  0.02::factZ:-or(factA,factB).

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

  query(conclusion).
  
Either 'Emily is a sheep' or 'Lily is a frog' but not both.