COMMANDS

• C – Change colour to the next one from
  the cyclic sequence:
  black,
  blue,
  green,
  cyan,
  red,
  magenta,
  yellow, and
  white.

• F – Move forward by one cell and paint
  the new cell.

• R – Rotate clockwise by 45°.

• S – Sleep for 20 ms.

• [ – Begin a repeatable block and continue
  executing subsequent code normally.