It is probable that Lily is a lion. It is highly unlikely that Emily is a mouse. It is highly likely that Bernhard is green. It is likely that if either 'Lily is a lion' or 'Emily is a mouse' but not both then Julius is a swan. It is highly likely that if 'Lily is a lion' or 'Emily is a mouse' or both then John discarded the milk. There is almost no chance that if either 'Emily is a mouse' or 'Lily is a lion' but not both then Mary took the football.
There is a very good chance that 'Emily is a mouse' or 'Mary took the football' or both.
It is highly unlikely that 'Emily is a mouse' or 'Mary took the football' or both.
There is a very good chance that 'Emily is a mouse' or 'Mary took the football' 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
  0.7::factA.
  0.05::factB.
  0.9::factC.
  %hop1
  0.7::factX:-xor(factA,factB).
  0.9::factY:-or(factA,factB).
  0.02::factZ:-xor(factB,factA).

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

  query(conclusion).
  
'Emily is a mouse' or 'Mary took the football' or both.