(0,a),(0,b),(0,c),(1,a),(1,b),(1,c) (a,0),(a,2),(b,0),(b,2),(c,0),(c,2),(0,a),(0,b),(0,c),(2,a),(2,b),(2,c) 5 생략 21 15/제2사분면,제3사분면,제4분면,
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