Sorting Sublists

I am trying to do a sort by key for a series of sublists. Sort by key does not allow for this natively so I got creative and 10 * [list index] to the values, flattened the lists, sorted by key, then grouped by keys to get my groups back. I assume there is a more elegant way of doing this. Anyone care to school me on it. Thanks.

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Excellent. Thank you.