It is improbable that Greg is white. It is almost certain that John put down the apple. There is almost no chance that Winona is a sheep. We believe that if 'Winona is a sheep and Greg is white' then Lily is yellow. There is a very good chance that if 'Greg is white and Winona is a sheep' then Brian is a lion. It is improbable that if 'John put down the apple' or 'Winona is a sheep' or both then Mary got the milk.
There is a better than even chance that 'John put down the apple and Winona is a sheep'.
There is almost no chance that 'John put down the apple and Winona is a sheep'.
There is a better than even chance that 'John put down the apple and Winona is a sheep'.

  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
  0.1::factA.
  0.95::factB.
  0.02::factC.
  %hop1
  0.75::factX:-and(factC,factA).
  0.8::factY:-and(factA,factC).
  0.1::factZ:-or(factB,factC).

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

  query(conclusion).
  
'John put down the apple and Winona is a sheep'.