obsidian

local side = 1
function forward()
turtle.digDown()
turtle.forward()
local items = turtle.getItemCount(16)
if items == 64 then
reboot()
 end
 end
function turn()
if side == 1 then
turtle.turnRight()
else turtle.turnLeft()
 end
 end
function row()
forward()
forward()
forward()
forward()
forward()
forward()
forward()
forward()
forward()
turn()
turtle.forward()
turn()
if side == 1 then
side = 0
else side = 1
 end
 end
function level()
row()
row()
row()
row()
row()
row()
row()
row()
row()
turtle.turnLeft()
turtle.turnLeft()
turtle.down()
 end
function go()
local times = read()
if times ~= 0  then
level()
else reboot()
 end
 end
go()