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var labels = [
"",
"Introduction",
"The 3D Workplace",
"inspect the 3D view ",
"Basic Object functions",
"Create an Object",
"Basic Edit functions",
"Vertices, Edges, Faces",
"Select/Deselect",
"Shift, Scale, Rotate",
"Undo, Redo",
"Keyboard Shortcuts",
"Top-, Side- and Front View",
"Border Select",
" A transformation example",
"The Viewing Plane",
"Keyboard Shortcuts",
"Mouse Gestures",
"Summary",
];