D	DIRECTIONS
R	palette
r	last_token
S	SPRITES

q	width
p	height
W	width
H	height

r	running
c	color
b	direction
p	px
q	py
h	history
g	growth_target
s	score
a	last_item_color
m	chain_item_count
n	chain_length
l	max_chain_length
cc	frame_parity
f	new_item
e	endgame

p	speed
M	movement_delay

ii	input_buffer
j	input_write_index
k	input_read_index

o	grid

z	item_serial_number

p		dx
q		dy

	render

w		score_status
v		chain_status
i		i
x		row
y		cell

it	input_thread

v		new_direction
w		key
w		nx

tt	last_movement
d	d
d	next_cell
w	next_action
t	current_time
t	dirty_pixels
d	i
u	need_to_place_item

w		pass
p		dx
q		dy

x	erase_x
y	erase_y

a	max_area
g	grade
i	max_items
w	i