Increase letter value each loop.

Hi!

Once again I turn to this expert panel for some help.

I know there is a way to increase numeric value in a loop like:

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But is there any way to increase a letter value, from a to b to c and so on in each loop turn.
Or like "i1" would in each loop, increase the number like i1, i2, i3 and so on?

tia

Ah!
Thanks! Now i have something to work with.