2๋ฐ”ํ€ด = ์žฌ๋ฏธ ์กด๋‚˜๋ด„
์˜ฌ์˜คํ”ˆ = ์‹œ๋ฐœ ์žฌ๋ฏธ๋ชป๋ด„