It is unlikely that Bill went to the garden. There is almost no chance that Brian is white. There is almost no chance that Jessica is a mouse. We believe that if 'Jessica is a mouse and Bill went to the garden' then Lily is a frog. There is a better than even chance that if 'Brian is white' or 'Bill went to the garden' or both then Winona is a mouse. It is probable that if 'Bill went to the garden' or 'Jessica is a mouse' or both then Sandra got the milk.
It is unlikely that 'Lily is a frog' or 'Sandra got the milk' or both.
It is unlikely that 'Lily is a frog' or 'Sandra got the milk' or both.
There is a very good chance that 'Lily is a frog' or 'Sandra got 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
  0.2::factA.
  0.02::factB.
  0.02::factC.
  %hop1
  0.75::factX:-and(factC,factA).
  0.6::factY:-or(factB,factA).
  0.7::factZ:-or(factA,factC).

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

  query(conclusion).
  
'Lily is a frog' or 'Sandra got the milk' or both.