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for-each and summing based on group

Subject: for-each and summing based on group
From: "dsk" <dmitrik@xxxxxxxxxxxxxx>
Date: Tue, 4 Jan 2005 23:09:20 -0500
 for-each and summing based on group
within a for-each there might be various sets of values which produce the 
following grid, where val is equal to a number

a  val val val
a  val val val
a  val val val
b  val val val
b  val val val
c  val val val
c  val val val

what is the best way to insert a sum line for the first
column a, one for b, and one for c.

is a nested for each needed? or checking to see if the following value is 
not equal to the preceding, then then summing?

thanks,
Dmitri

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