It is highly unlikely that Greg is a rhino. It is likely that Jason is tired. There is almost no chance that Lily is a frog. There is almost no chance that if 'Jason is tired and Greg is a rhino' then Julius is white. It is almost certain that if either 'Lily is a frog' or 'Greg is a rhino' but not both then John got the milk. It is improbable that if 'Greg is a rhino and Lily is a frog' then Bernhard is a swan.
It is almost certain that 'Bernhard is a swan' or 'Lily is a frog' or both.
There is almost no chance that 'Bernhard is a swan' or 'Lily is a frog' or both.
It is almost certain that 'Bernhard is a swan' or 'Lily is a frog' 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
  0.05::factA.
  0.7::factB.
  0.02::factC.
  %hop1
  0.02::factX:-and(factB,factA).
  0.95::factY:-xor(factC,factA).
  0.1::factZ:-and(factA,factC).

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

  query(conclusion).
  
'Bernhard is a swan' or 'Lily is a frog' or both.