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use feature ':5.10';
use strict;
...
say join( "\n", sort { $a cmp $b } uniq_phrases( $test_sentence, 4 ) )
+;

__END__

(use '[clojure.contrib.str-utils :only (re-split str-join)])

...
; interpreted, dynamic programming language.
; is a high-level, general-purpose,
; "Elapsed time: 1.227 msecs"