Why its i-l index I am not getting this only (segmented seive)

why its i-l index I am not getting this only

which line ??
i- l is written where?

here

starting video from 7:00 bhaiya explains that we need to cross those no which are not multiples of x in the range m to n
so since we are making a array not from m to n
so
i-m humara uss array index ki range walle non prime no ko strike off karne ko bol raha h

please listen at 7:00 about what bhaiya is saying

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