空值数 提取 (12018)

E2:F7{=IFERROR(RIGHT(SMALL(IFERROR(TEXT(FREQUENCY(IF(B$2:B$25="",ROW($2:$25)),IF(B$2:B$25<>"",ROW($2:$25))),"0;;A")+ROW($1:$9)/1%,""),ROW(A1)),2)*1,"")