There is a better than even chance that Emily is a sheep. There is little chance that Jessica is a sheep. We doubt that Daniel dropped the milk. Chances are slight that if either 'Emily is a sheep' or 'Daniel dropped the milk' but not both then Lily is yellow. It is probably the case that if either 'Daniel dropped the milk' or 'Jessica is a sheep' but not both then Bill went to the office. It is probably the case that if 'Emily is a sheep and Daniel dropped the milk' then Greg is a swan.
Chances are slight that either 'Jessica is a sheep' or 'Emily is a sheep' but not both.
There is a better than even chance that either 'Jessica is a sheep' or 'Emily is a sheep' but not both.
Chances are slight that either 'Jessica is a sheep' or 'Emily 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
  0.6::factA.
  0.1::factB.
  0.2::factC.
  %hop1
  0.1::factX:-xor(factA,factC).
  0.7::factY:-xor(factC,factB).
  0.7::factZ:-and(factA,factC).

  %hop2
  conclusion:-xor(factB,factA).

  query(conclusion).
  
Either 'Jessica is a sheep' or 'Emily is a sheep' but not both.