Minecraft turtle tree chop

for u=1,55 do
local i = 1
turtle.select(1)
turtle.place()
sleep(1)
turtle.select(2)
turtle.place()
sleep(1)
for i=1,10 do
 turtle.dig()
 turtle.digUp()
 turtle.up()
 print("Chooped a layer")
end

for o=1,10 do
 turtle.down()
end

print("Tree chooped down, depositing wood...")
turtle.turnLeft()
turtle.turnLeft()
turtle.select(4)
turtle.drop()
turtle.select(3)
turtle.drop()
turtle.turnLeft()
turtle.turnLeft()
print("Finished")
end