We doubt that Winona is a mouse. There is a very good chance that Jessica is a cat. There is little chance that Daniel dropped the milk. There is a better than even chance that if either 'Winona is a mouse' or 'Jessica is a cat' but not both then Mary moved to the garden. We doubt that if 'Jessica is a cat and Daniel dropped the milk' then John went to the office. It is likely that if either 'Daniel dropped the milk' or 'Winona is a mouse' but not both then Bernhard is gray.
There is a very good chance that 'Daniel dropped the milk' or 'Jessica is a cat' or both.
There is a very good chance that 'Daniel dropped the milk' or 'Jessica is a cat' or both.
It is impossible that 'Daniel dropped the milk' or 'Jessica is a cat' 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
  0.2::factA.
  0.8::factB.
  0.1::factC.
  %hop1
  0.6::factX:-xor(factA,factB).
  0.2::factY:-and(factB,factC).
  0.7::factZ:-xor(factC,factA).

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

  query(conclusion).
  
'Daniel dropped the milk' or 'Jessica is a cat' or both.