10 9, Ƽ ο ѱ ϰ ִ ߽ ܿ ѱ۳ Ͽ ƯȰ Ͽٰ . ̽ ܿ ġ ʹ(A, B) 躸 ܿ ġ ʱ(A, B) 3ȸ ǹǷ Ȱ ȹǾ.
ʹݿ л ǻ ѱ , ־ ܾ ϱ Ȱ Ͽ. ο û鿡Դ ǻ ͼ ʾ ݹ ã Էϴ л鵵 ־, ־ 縦 Ȱ ùٸ ° ϱ⸦ ۼ ð .
ʱݿ ѱ ϱ⸦ ߽ ܾ ã, ؿ, ϸ ð . л ܾ ̱ ƽ 巯´.