问题描述：
请教筛选公式数组含义 =INDEX(A:B,SMALL(IF(MATCH(A$2:A$19&B$2:B$19,A$2:A$19&B$2:B$19,)=ROW($1:$18),R
=INDEX(A:B,SMALL(IF(MATCH(A$2:A$19&B$2:B$19,A$2:A$19&B$2:B$19,)=ROW($1:$18),ROW($2:$19),4^8),ROW(A1)),{1,2})&""
=INDEX(A:B,SMALL(IF(MATCH(A$2:A$19&B$2:B$19,A$2:A$19&B$2:B$19,)=ROW($1:$18),ROW($2:$19),4^8),ROW(A1)),{1,2})&""
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