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#!/usr/bin/env perl

...
Hello, i'm 18
1 this year is 2019 1
1 2 3 - 4

%encountered = (
                 '3' => [
...
3: '1 2 3 - 4'
2: '1 2 3 - 4'
1: '1 this year is 2019 1', '1 this year is 2019 1', '1 2 3 - 4'