Controls:

• Hold "n" and press a number key to change the value of n (two digit values of n yet to come)
• Type k numbers and press enter to create a rim
• Pressing tab or shift+tab will cycle through which rims are selected (they are "bold" when selected)
• Arrow keys: move selected rim
• c/x: cycle selected rim
• f: vertically flip selected rim
• d: duplicate selected rim
• g: toggle grid points
• +/-: Increase or decrease grid size
• l: toggle labels