Found a potential bug. After the Artisan asks you to use the cp command to make gear1/gear2/gear3/gear4/gear5, I accidentally made an extra Gear (using "cp Gear Gear"). The Artisan message for creating the 5 gears persists (presumably because there's an extra Gear?). Cannot del, rm, sudo anything, mv, or otherwise get rid of the extra Gear, so I'm stuck sans finishing the task with the Artisan. :(