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bash merge 2 lists removing duplicated

I have an embedded linux system using Busybox (OpenWRT) - so commands are limited. I have two files that look like: first file aaaaaa bbbbbb cccccc mmmmmm nnnnnn second file mmmmmm nnnnnn ...
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How to grep a text recursively on BusyBox 1.0?

How can I find a file containing a certain string on a BusyBox 1.0, if grep -r does not work?