translation-value-sets/iw/units_length_set.php

<?PHP
declare(strict_types = 1);
array (
  'units_length_set' => 
  array (
    'm' => 'm',
    'dm' => 'dm',
    'cm' => 'cm',
    'mm' => 'mm',
    'ft' => 'ft',
    'in' => 'inch',
  ),
)