Try:
Usernames
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Names
Numbers
Pronounceable name ideas, not keyboard smash.
One name per line is easiest. Max 1000.
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Re-checks the name every 10 seconds, forever, until you stop it. Keeps working with the tab in the background. You get a ping the second it drops.
Names
Numbers
Checks names nonstop until you stop it. Valid ones land in one tab, the rest in the other.