What algorithms have you tried?

As I understand it, all you want to do is:

• If the line is NOT event #{counter} set counter to undef/zero
• If the line is event #1, set counter to 1
• If the line is event #{counter}, increment counter
• If the counter is now greater than {num events: IE 4}, save the last four lines off to somewhere and reset the counter to undef/zero

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