00000nz  a2200000n  4500
001  KSH1998020858
005  20051228200814
008  980429 n azknn|abn          |a a|a    | 
150  ▼a기저 단계[基底段階]▲
450  ▼wr▼i영어▼abase step▲
550  ▼a귀납법[歸納法]▲
550  ▼a증명(논리)[證明]▲