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Yout can do this with two commands
awk 'NR==23; NR==89'
or with a logical or
awk 'NR==23 || NR==89'
This is the short condition{action} form where the default action is print.

So it's actually not home work for a course...

Did you read the man pages for awk?
man awk
The record number (usually the line number) is NR. Also because the main code is a loop, you can simply...