There is almost no chance that Emily is a mouse. We believe that Lily is white. It is impossible that John went to the bedroom. It is probably the case that if 'Lily is white' or 'Emily is a mouse' or both then Fred put down the apple. It is improbable that if either 'Lily is white' or 'Emily is a mouse' but not both then Sandra left the milk. There is a better than even chance that if 'Lily is white and Emily is a mouse' then Julius is a frog.
There is a very good chance that 'Emily is a mouse' or 'Sandra left the milk' or both.
There is little chance that 'Emily is a mouse' or 'Sandra left the milk' or both.
There is a very good chance that 'Emily is a mouse' or 'Sandra left 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
  0.02::factA.
  0.75::factB.
  0.0::factC.
  %hop1
  0.7::factX:-or(factB,factA).
  0.1::factY:-xor(factB,factA).
  0.6::factZ:-and(factB,factA).

  %hop2
  conclusion:-or(factA,factY).

  query(conclusion).
  
'Emily is a mouse' or 'Sandra left the milk' or both.