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hi this is a homework assignment i need some help with

it mostly works.

script file

#!/usr/bin/env bash

#create dictionary file
grep -E '.{3}' /usr/share/dict/british-english > db.txt
...

Hi,
I have this text file with these words and I need help with removing words with repeated letter from these lines.


1 ama
5 bib
29 bob
2 bub
5 civic
...