We doubt that Sandra left the milk. It is likely that Lily is a rhino. It is unlikely that Julius is a lion. It is probably the case that if 'Lily is a rhino and Sandra left the milk' then Jessica is a sheep. It is highly likely that if either 'Lily is a rhino' or 'Sandra left the milk' but not both then Brian is a frog. It is unlikely that if 'Sandra left the milk' or 'Julius is a lion' or both then Mary went to the hallway.
It is almost certain that either 'Mary went to the hallway' or 'Jessica is a sheep' but not both.
It is improbable that either 'Mary went to the hallway' or 'Jessica is a sheep' but not both.
It is almost certain that either 'Mary went to the hallway' or 'Jessica is a sheep' 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
  0.2::factA.
  0.7::factB.
  0.2::factC.
  %hop1
  0.7::factX:-and(factB,factA).
  0.9::factY:-xor(factB,factA).
  0.2::factZ:-or(factA,factC).

  %hop2
  conclusion:-xor(factZ,factX).

  query(conclusion).
  
Either 'Mary went to the hallway' or 'Jessica is a sheep' but not both.