mine

local i = 1;
local x = 1;

turtle.refuel(1);
turtle.select(2);
turtle.forward();

  while (i < 21) do
    turtle.down();
    i = i + 1;
  end;
i = 1;
print(i);
while (i < 3) do
  while (x < 17) do
    turtle.placeDown();
    turtle.forward();
    x = x + 1;
  end;
  i = i+1;
  turtle.turnRight();
end;