http://www.purl.org/tcl/home/man/tcl8.4/TclCmd/lrange.htm 

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'''lrange $x 0 end''' may be used to force a list x to have list (as opposed to string) representation - this enhances performance in some situations.
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See also [list], [lappend], [lindex], [linsert], [llength], [lreplace], [lsearch], [lsort] .
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