00000nz  a2200000n  4500
001  KSH2000031990
005  20000820095115
008  000820 n azknn|abn          |a a|a    | 
150  ▼a환위[換位]▲
450  ▼wr▼i영어▼aconversion▲
550  ▼wg▼a변형 추리[變形推理]▲
550  ▼a환질[換質]▲