It is impossible that Daniel took the milk. It is almost certain that Emily is a mouse. There is almost no chance that Julius is a swan. Chances are slight that if 'Daniel took the milk' or 'Emily is a mouse' or both then Greg is gray. It is highly unlikely that if either 'Daniel took the milk' or 'Julius is a swan' but not both then Bernhard is yellow. There is almost no chance that if 'Daniel took the milk' or 'Emily is a mouse' or both then John went to the garden.
There is little chance that 'Greg is gray and Emily is a mouse'.
There is little chance that 'Greg is gray and Emily is a mouse'.
It is probably the case that 'Greg is gray and Emily is a mouse'.

  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
  0.0::factA.
  0.95::factB.
  0.02::factC.
  %hop1
  0.1::factX:-or(factA,factB).
  0.05::factY:-xor(factA,factC).
  0.02::factZ:-or(factA,factB).

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

  query(conclusion).
  
'Greg is gray and Emily is a mouse'.