Maybe this helps?

use List::Util qw/min max/;
# ...
$HoA_sequence{$_} //= '-'
  for min(keys %HoA_sequence) .. max(keys %HoA_sequence);

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In reply to Re^3: How to add missing part in a Hash of Array by Anonymous Monk
in thread How to add missing part in a Hash of Array by Anonymous Monk

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