letters, Php - rextester

letters

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#^(?:к(?!\1)()|о(?!\2)()|л(?!\3)()|е(?!\4)()|с(?!\5)()|о(?!\6)())++$#u
array(2) {
  [0]=>
  string(12) "колесо"
  [2]=>
  string(12) "оселок"
}

λ

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