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use strict;
use warnings;
...
   shift @array;
   $idx++
}

<$array[0] == 1> 1 2 3 4 5 6 7 8 9 10
<$array[1] == 3> 2 3 4 5 6 7 8 9 10
<$array[2] == 5> 3 4 5 6 7 8 9 10
<$array[3] == 7> 4 5 6 7 8 9 10
<$array[4] == 9> 5 6 7 8 9 10