<?php function groupBySameLetters(array $words): array { $groups = []; foreach ($words as $word) { $letters = mb_str_split($word); sort($letters); $key = implode('', $letters); $groups[$key][] = $word; } return array_values($groups); } // Приклад використання: $input = ['ab', 'ac', 'ba', 'ca']; $result = groupBySameLetters($input); print_r($result);
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