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a1_2 a1_1 a10_10 a2_10 a2_1 a2_2 a10_1 a10_2 a1_10

a1_1 a1_2 a1_10 a2_1 a2_2 a2_10 a10_1 a10_2 a10_10

use strict;
use warnings;
...

print "@new_list\n";