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Sub a1()
For x = 1 To 50
Cells(x, 1) = "ai"
Next x
End Sub
Sub ex()
For x = 1200 To 2 Step -3
Cells(x, 1).EntireRow.Insert
Next x
End Sub
Sub a2()
For x = 2 To 1200 Step 3
Cells(x, 1).EntireRow.Insert
Next x
End Sub