plotter

pos = 0

function selectConcrete()
  for i = 1, robot.inventorySize()/2 do
    if robot.count(i*2-1) ~= 0 then
      robot.select(i*2-1)
      break
    end
  end
end

function selectGlass()
  for i = 1, robot.inventorySize()/2 do
    if robot.count(i*2) ~= 0 then
      robot.select(i*2)
      break
    end
  end
end

function swap()
    if pos == 0 then
        robot.turnLeft()
        robot.forward()
        robot.turnLeft()
        pos = 1
    else
        robot.turnRight()
        robot.forward()
        robot.turnRight()
        pos = 0
    end
end

function pattern1()
    for i = 1, 15 do
        selectConcrete()
        robot.placeDown()
        robot.forward()
    end
    selectConcrete()
    robot.placeDown()
end

function pattern2()
    selectConcrete()
    robot.placeDown()
    robot.forward()
    for i = 1, 14 do
        selectGlass()
        robot.placeDown()
        robot.forward()
    end
    selectConcrete()
    robot.placeDown()
end

pattern1()
swap()

for i = 1, 14 do
    pattern2()
    swap()
end

pattern1()