It is impossible that Lily is green. It is highly likely that Greg is a lion. There is almost no chance that Brian is a swan. It is likely that if either 'Greg is a lion' or 'Lily is green' but not both then Winona is a mouse. It is certain that if 'Brian is a swan' or 'Lily is green' or both then Bernhard is a rhino. It is impossible that if 'Lily is green and Greg is a lion' then Jessica is a sheep.
It is highly unlikely that either 'Winona is a mouse' or 'Lily is green' but not both.
There is a better than even chance that either 'Winona is a mouse' or 'Lily is green' but not both.
It is highly unlikely that either 'Winona is a mouse' or 'Lily is green' 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
  0.0::factA.
  0.9::factB.
  0.02::factC.
  %hop1
  0.7::factX:-xor(factB,factA).
  1.0::factY:-or(factC,factA).
  0.0::factZ:-and(factA,factB).

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

  query(conclusion).
  
Either 'Winona is a mouse' or 'Lily is green' but not both.