Many lines are grouped together under a "parent" line; for example the 171 and 175 are under the 171. The 144, 145, 148, 162, 163 and 164 are all under the 164. If I had to guess I'd say the 11, 28 and 29 are all under the 29. What other groupings are set up that way and what is the reason for it? Just curious.
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