ethanol

function placeleft()
  turtle.turnRight()
  turtle.forward()
  turtle.turnLeft()
  turtle.place()
end

function placeright()
  turtle.turnLeft()
  turtle.forward()
  turtle.turnRight()
  turtle.place()
end

function goto()
  turtle.turnLeft()
  turtle.turnLeft()
  turtle.forward()
  turtle.forward()
  turtle.forward()
  turtle.turnRight()
  turtle.forward()
  turtle.forward()
  turtle.forward()
  turtle.forward()
  turtle.turnLeft()
  turtle.place()
end

function rowleft()
  placeleft()
  placeleft()
  placeleft()
  placeleft()
  placeleft()
  placeleft()
  placeleft()
  placeleft()
  placeleft()
  placeleft()
end

function rowright()
  placeright()
  placeright()
  placeright()
  placeright()
  placeright()
  placeright()
  placeright()
  placeright()
  placeright()
  placeright()
end

function rowup()
  turtle.up()
  turtle.place()
end

function rowdown()
  turtle.down()
end

function returnto()
  turtle.turnRight()
  turtle.turnRight()
  turtle.turnRight()
  turtle.forward()
  turtle.forward()
  turtle.forward()
  turtle.forward()
  turtle.forward()
  turtle.forward()
  turtle.forward()
  turtle.forward()
  turtle.forward()
  turtle.forward()
  turtle.forward()
  turtle.forward()
  turtle.forward()
  turtle.forward()
  turtle.turnLeft()
  turtle.forward()
  turtle.forward()
  turtle.forward()
end

while true do
  if rs.getInput("bottom") then
  turtle.select(1)
  turtle.dig()

  goto()
  rowleft()
  rowup()
  rowright()
  rowup()
  rowleft()
  rowdown()
  rowdown()

  returnto()

  sleep(2)

end
  sleep(2)
end