letters, Php - rextester

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

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