Q: select query

I am trying to write a query to select some rows.

My data consists of rows like this
  1       a  1       b  1       c  2       d  3       e  3       f  ...

I would like to select the second and subsequent rows where the first
column is the same:
  1       b  1       c  3       f

in other words, all but the first row of a group.

Any ideas?

Thanks, Ralph