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}
}</lang>
=={{header|PicoLisp}}==
<lang PicoLisp>(de repString (Str)
(let Lst (chop Str)
(for (N (/ (length Lst) 2) (gt0 N) (dec N))
(T
(use (Lst X)
(let H (cut N 'Lst)
(loop
(setq X (cut N 'Lst))
(NIL (head X H))
(NIL Lst T) ) ) )
N ) ) ) )</lang>
Test:
<lang PicoLisp>(test 5 (repString "1001110011"))
(test 4 (repString "1110111011"))
(test 3 (repString "0010010010"))
(test 4 (repString "1010101010"))
(test 5 (repString "1111111111"))
(test NIL (repString "0100101101"))
(test 3 (repString "0100100"))
(test NIL (repString "101"))
(test 1 (repString "11"))
(test 1 (repString "00"))
(test NIL (repString "1"))
(test NIL (repString "0100101"))</lang>
=={{header|PL/I}}==
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