#!/usr/bin/env bash

echo 'blah' | \
    tr 'ah' 'lo' | \
    sed -e 's/^[a-z]/H/' | \
    awk '{n=split($0,a,"");
        for (i in a) {if (a[i]=="H") print i " " a[i] "e";
        else print i " " a[i];} print n+1 " " "!"}' | \
    sort | \
    cut -d' ' -f2 | \
    paste -s -d '\0' -
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