Shell game (Rhyme)

Three nut shells;

nutshells, three

and under one

shall I place a pea.

Now watch them well

they will be switched

then you must tell

which shell is which.

I swap them round;

round, them, I swap;

swap them again

and then I stop.

Did you watch well?

Can you tell me

which shells the shell which

hides the pea?