# Applies a command `cmd` to `self`, returns the number of operations performed during the command
	fun do_cmd(cmd: String): Int do
		if cmd == "" then return 0
		var iters = 1
		var cmdln = cmd.length
		if cmd[cmdln - 1] == '2' then
			iters = 2
		end
		var cmd1 = cmd[0]
		var cmd2 = '\0'
		if cmdln > 1 then
			cmd2 = cmd[1]
			if cmd2 == '2' then cmd2 = '\0'
		end
		for i in [1 .. iters] do
			if cmd1 == 'U' then
				if cmd2 == '\'' then
					cclock_U
				else
					clock_U
				end
			else if cmd1 == 'L' then
				if cmd2 == '\'' then
					cclock_L
				else
					clock_L
				end
			else if cmd1 == 'F' then
				if cmd2 == '\'' then
					cclock_F
				else
					clock_F
				end
			else if cmd1 == 'R' then
				if cmd2 == '\'' then
					cclock_R
				else
					clock_R
				end
			else if cmd1 == 'B' then
				if cmd2 == '\'' then
					cclock_B
				else
					clock_B
				end
			else if cmd1 == 'D' then
				if cmd2 == '\'' then
					cclock_D
				else
					clock_D
				end
			else if cmd1 == 'M' then
				if cmd2 == '\'' then
					cclock_M
				else
					clock_M
				end
			else if cmd1 == 'E' then
				if cmd2 == '\'' then
					cclock_E
				else
					clock_E
				end
			else if cmd1 == 'S' then
				if cmd2 == '\'' then
					cclock_S
				else
					clock_S
				end
			else if cmd1 == 'u' then
				if cmd2 == '\'' then
					cclock_u
				else
					clock_u
				end
			else if cmd1 == 'l' then
				if cmd2 == '\'' then
					cclock_l
				else
					clock_l
				end
			else if cmd1 == 'f' then
				if cmd2 == '\'' then
					cclock_f
				else
					clock_f
				end
			else if cmd1 == 'r' then
				if cmd2 == '\'' then
					cclock_r
				else
					clock_r
				end
			else if cmd1 == 'b' then
				if cmd2 == '\'' then
					cclock_b
				else
					clock_b
				end
			else if cmd1 == 'd' then
				if cmd2 == '\'' then
					cclock_d
				else
					clock_d
				end
			else if cmd1 == 'X' then
				if cmd2 == '\'' then
					ccube_X_rotation
				else
					cube_X_rotation
				end
			else if cmd1 == 'Y' then
				if cmd2 == '\'' then
					ccube_Y_rotation
				else
					cube_Y_rotation
				end
			else if cmd1 == 'Z' then
				if cmd2 == '\'' then
					ccube_Z_rotation
				else
					cube_Z_rotation
				end
			else
				abort
			end
		end
		return iters
	end