てはいけない - Grammar Discussion

In sentence 1 of this point - そこにはいってはいけない。
I keep failing by inputting ては instead of っては. Could someone explain me, why is it っては in this specific sentence? Is this some conjugation rule of previous grammar point, and if so then could you guide me towards it, so I can read about it a bit more?

When it says verb(て) it’s looking for the て form of the verb. 入る is a godan verb, not ichidan. So it’s て form is 入って

This point includes the て forms for all endings

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