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Hi,
Maybe with sed below but with same resultat give by RudiC:
sed -e 's/.\{7\}\|.\{1,6\}$/_&/g;s/^_//;s/_\(.\)[0-9]*/\1/g' file
Regards.

... I'm curious how fast the awk solutions will be.

Here the test data generator (about 1 GB Data):


#!/bin/bash

tr -dc '0-9' </dev/urandom | fold -w45000 | while read line ;do
...