numeric operations w/ lists

Hello all,

X is a list of 20 lists, and each individual list has 65 elements.

Y is a list of 65 elements.

WANT:  subtract Y from each of the 20 lists in X.

Here's what I tried and the error messages:

X - rep(Y, 20)

Error in X - rep(Y 20) : non-numeric argument to binary operator

I tried several methods w/o success.  Any suggestions kindly
appreciated.

Thanks,
Dave

ps - please copy afshar at miami.edu in the reply, as I've had 
problems receiving the daily digest.