/usr/lib/s9fes/help/string-unsplit is in scheme9 2010.11.13-2.
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1 2 3 4 5 6 | S9 LIB (string-unsplit char list) ==> string
Unsplit a list of strings, giving a new string. CHAR is placed between
each two elements of LIST.
(string-unsplit #\: '("" "a" "b" "" "c")) ==> ":a:b::c"
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