IxI

turtle.select(1)
turtle.refuel(64)
i=18
e=i
z=i+1
while true do
if z<1 then
exit()
end
while e>0 do
turtle.dig()
turtle.forward()
e=e-1
end
z=z-1
if z<1 then
exit()
end
e=i
turtle.turnRight()
turtle.dig()
turtle.forward()
turtle.turnRight()
while e>0 do
turtle.dig()
turtle.forward()
e=e-1
end
e=i
z=z-1
turtle.turnLeft()
turtle.dig()
turtle.forward()
turtle.turnLeft()
end