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Task/Variable-size-Set/Tcl/variable-size-set-2.tcl
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Task/Variable-size-Set/Tcl/variable-size-set-2.tcl
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% proc range_trace {n _var el op} {upvar 1 $_var v; set v [string range $v 0 [incr n -1]]}
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% trace var baz w {range_trace 2}
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% set baz Frankfurt
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Fr
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