連續加總偶數 插入一空白 (14382)

E2:F2 下拉{=IF((MOD(SUM(IFERROR(VLOOKUP(T(IF({1},$E$1:$E1)),$B:$C,2,)*1,)),2)=1)+($E1="")+(ROW(A1)=1),OFFSET(B$1,COUNTIF($E$1:$E1,"><"),)&"","")