<?php $input = [ "Lincoln Crown", "Crown Court", "go holiday", "house fire", "John Hinton", "Hinton Jailed" ]; $output = []; while ($input) { $output[] = $words = array_shift($input); $input = preg_grep('~\b(?:\Q' . str_replace(' ', '\E|\Q', $words) . '\E)\b~', $input, PREG_GREP_INVERT); } var_export($output);
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