Chances are about even that Sandra put down the milk. It is highly unlikely that John picked up the apple. There is a better than even chance that Mary moved to the garden. It is probable that if 'Mary moved to the garden and Sandra put down the milk' then Gertrude is a mouse. It is probably not the case that if 'Sandra put down the milk' or 'John picked up the apple' or both then Julius is a frog. It is almost certain that if 'Sandra put down the milk and John picked up the apple' then Lily is a lion.
There is almost no chance that 'John picked up the apple and Julius is a frog'.
There is almost no chance that 'John picked up the apple and Julius is a frog'.
It is certain that 'John picked up the apple and Julius is a frog'.

  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
  0.5::factA.
  0.05::factB.
  0.6::factC.
  %hop1
  0.7::factX:-and(factC,factA).
  0.25::factY:-or(factA,factB).
  0.95::factZ:-and(factA,factB).

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

  query(conclusion).
  
'John picked up the apple and Julius is a frog'.