Flexible Concatenation Function

[Rick Rothstein]

Rick, Is there a way to concatenate lists of data that are of variable lengths set apart by indicators?

Example:

----------
a
b
c
----------
e
f
g
h
i
j
----------
k
l
m
n
----------

Clarification.... are those values all in one cell or is each line in a cell by itself? If individual cells, could the "indicator" be an empty cell instead of a series of dashes (that would make coding easier)? Do you have a preferred delimiter for the resulting concatenated text?