It is improbable that Greg is a lion. There is a better than even chance that Julius is a rhino. It is certain that Lily is a frog. It is likely that if 'Lily is a frog' or 'Greg is a lion' or both then Jason is thirsty. Chances are slight that if 'Greg is a lion and Julius is a rhino' then Mary went to the office. It is probably the case that if either 'Julius is a rhino' or 'Greg is a lion' but not both then Sandra grabbed the apple.
It is probably not the case that either 'Lily is a frog' or 'Greg is a lion' but not both.
It is highly likely that either 'Lily is a frog' or 'Greg is a lion' but not both.
It is probably not the case that either 'Lily is a frog' or 'Greg is a lion' 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
  0.1::factA.
  0.6::factB.
  1.0::factC.
  %hop1
  0.7::factX:-or(factC,factA).
  0.1::factY:-and(factA,factB).
  0.7::factZ:-xor(factB,factA).

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

  query(conclusion).
  
Either 'Lily is a frog' or 'Greg is a lion' but not both.