Syntax
Each character in Cubically source code is either a command or an argument. For example:
code: RL2UD23
does: R call command R without arguments
L2 call command L with argument 2
U call command U without arguments
D23 call command D with argument 2, then argument 3
Each argument may only be a single-digit integer; multiple arguments call the command separately. As in the example, D23 does not call D with argument 23, it calls D with argument 2, then argument 3.
There is one exception to the above rule: the f command. Arguments stack up, so f23 will call f with 23. To call f with 2 and then 3 you would have to write f2f3.
For more information about arguments and commands, see commands.