It is probable that John took the milk. It is probably not the case that Emily is a wolf. There is a better than even chance that Brian is white. There is a very good chance that if 'Brian is white and Emily is a wolf' then Jeff left the apple. Chances are about even that if 'Brian is white and Emily is a wolf' then Greg is a swan. We doubt that if either 'Emily is a wolf' or 'Brian is white' but not both then Lily is a rhino.
It is improbable that 'Lily is a rhino and John took the milk'.
It is improbable that 'Lily is a rhino and John took the milk'.
There is a very good chance that 'Lily is a rhino and John took the milk'.

  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.
  0.25::factB.
  0.6::factC.
  %hop1
  0.8::factX:-and(factC,factB).
  0.5::factY:-and(factC,factB).
  0.2::factZ:-xor(factB,factC).

  %hop2
  conclusion:-and(factZ,factA).

  query(conclusion).
  
'Lily is a rhino and John took the milk'.