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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