It is likely that Sandra got the milk. It is highly likely that John moved to the garden. It is probably not the case that Julius is a rhino. It is impossible that if 'John moved to the garden and Julius is a rhino' then Emily is a cat. There is almost no chance that if 'Sandra got the milk' or 'John moved to the garden' or both then Winona is a sheep. It is highly unlikely that if either 'John moved to the garden' or 'Julius is a rhino' but not both then Gertrude is a sheep.
It is impossible that 'Emily is a cat and Sandra got the milk'.
It is impossible that 'Emily is a cat and Sandra got the milk'.
Chances are about even that 'Emily is a cat and Sandra got the milk'.

  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
  0.7::factA.
  0.9::factB.
  0.25::factC.
  %hop1
  0.0::factX:-and(factB,factC).
  0.02::factY:-or(factA,factB).
  0.05::factZ:-xor(factB,factC).

  %hop2
  conclusion:-and(factX,factA).

  query(conclusion).
  
'Emily is a cat and Sandra got the milk'.