Tunnel3 Script ComputerCraft (3x3 tunnels)

args = {...}
Num = tonumber(args[1])
o = 0
repeat
 turtle.dig()
 turtle.forward()
 turtle.digUp()
 turtle.turnRight()
 turtle.dig()
 turtle.turnLeft()
 turtle.turnLeft()
 turtle.dig()
 turtle.turnRight()
 turtle.up()
 turtle.digUp()
 turtle.turnRight()
 turtle.dig()
 turtle.turnLeft()
 turtle.turnLeft()
 turtle.dig()
 turtle.turnRight()
 turtle.up()
 turtle.turnRight()
 turtle.dig()
 turtle.turnLeft()
 turtle.turnLeft()
 turtle.dig()
 turtle.turnRight()
 turtle.down()
 turtle.down()
 o = o + 1
until o == Num
if o == Num then
 m = 0
 for i = 1,16 do turtle.select(i)
 n = turtle.getItemCount(i) m = m+n
 end
 print("Tunneled "..Num.." Blocks")
 print("No failures")
 print("Mined "..(tostring(m)).." Blocks")
else
 print("Only able to tunnel "..o.." blocks
 i = Num - o
 print("Had "..i.." Errors")
end