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/usr/lib/vtk-5.8/tcl/vtktesting/vtktesting.tcl is in tcl-vtk 5.8.0-14.1ubuntu3.

This file is owned by root:root, with mode 0o644.

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package require -exact vtkcommon 5.8

foreach s {colors mccases backdrop grab} {
  source [file join [file dirname [info script]] "${s}.tcl"]
}

package provide vtktesting 5.8