There are already several tools to achieve what you want, writing your own is probably needless.
A standard Unix-like solution (works under bash):
$ diff <( sort master ) <( sort completed ) | grep '^<' | cut -d ' ' -
+f2-
Depending on your needs you may want to use sort -u instead of a simple sort.
Or if you're under some Debian-derivative distro just install the moreutils package and use combine:
$ combine master not completed
1ao8A
1jkxA
1juvA
1mejA
1meoA
1n0uA
1pjqA
Hope that helps.
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