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  HEADER:
    while (<STDIN>)  {
...
            if /^2/;
        print "--> $_";
}

  HEADER:
    while (my $line = <STDIN>)  {
...
            if '2' eq substr $line, 0, 1;
        print "--> $line";
}

    process_file_header();
    process_file_participants_list();
    process_file_contract_details();

given (determine_context()) {
    when ( $FOO ) { process_foo(); }
...
    when ( $BAZ ) { woo_ha(); }
    default { confused(); }
}