It is probably the case that Emily is a wolf. It is likely that Greg is a frog. It is almost certain that John went to the garden. It is impossible that if either 'John went to the garden' or 'Greg is a frog' but not both then Daniel put down the milk. It is improbable that if 'Greg is a frog' or 'Emily is a wolf' or both then Julius is white. We believe that if 'Greg is a frog and John went to the garden' then Lily is a swan.
It is probable that 'Greg is a frog' or 'Daniel put down the milk' or both.
It is probable that 'Greg is a frog' or 'Daniel put down the milk' or both.
It is highly unlikely that 'Greg is a frog' or 'Daniel put down the milk' 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.
  0.7::factB.
  0.95::factC.
  %hop1
  0.0::factX:-xor(factC,factB).
  0.1::factY:-or(factB,factA).
  0.75::factZ:-and(factB,factC).

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

  query(conclusion).
  
'Greg is a frog' or 'Daniel put down the milk' or both.