00000nz  a2200000n  4500
001  KSH1998035760
005  20021228000000
008  980429 n azknn|abn          |a a|a    | 
150  ▼a양방향 연산[兩方向演算]▲
450  ▼wr▼i영어▼abidirectional operation▲
550  ▼wg▼a수론[數論]▲
550  ▼wg▼a연산(계산)[演算]▲