ํฌํ•œํ•˜๊ฒŒ ์ค‘๊ธ‰๋ชจ๋ธ์—์„œ ๋ธ”ํˆฌ, 2.4 ๊ฒธ์šฉ์ด ๋งŽ๋˜๋ฐ