Five Brown Teddies

Five brown teddies sitting on a wall.
Five brown teddies sitting on a wall.
And if one brown teddy should accidently fall,
There'd be four brown teddies sitting on a wall.
Then:
a) Four brown teddies sitting on a wall...............
b) Three brown teddies sitting on a wall.............
c) Two brown teddies sitting on a wall..................
d) One brown teddy sitting on a wall......................
e) And if one brown teddy should accidently fall
There'd be no brown teddies sitting there at all!