õ 2 4 30 û ȸǽǿ δ 22 ‘(bottom-up) ̵ ߱ Ŀ’ ߴ.
ݳ 3 ó ‘δ’ ܺ ϰ پ ߱ϱ ڹ 7 ߽ ⱸ̴.
δ ʿ ϴ Ź ߱ϱ 4 ȸǸ ǽ, ȸ ߱ Źȿ ɵ ִ Ǹ ϱ õƴ.
̹ ȸ û ȥ (ڿ ), 忡 ٶ û뼳 , ǰ ü ¶ ÷ پ ߱Ǿ.
߱ ɵ ִ ǰ 9 ȸ(ǥ) ̸ ȿ ؼ μƼ긦 ȹ̴.
õ ڴ “ õ ߽ ÷ ֵ ּ ȹ”̶ .
Ŀ ̶ “Ŀ ռ ª ð ذϴ ” Ѵ.
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