```py
sheet = {"A": {}}
sheet["A"][1] = "monthly salary"
sheet["A"][2] = 3000
sheet["A"][3] = "yearly salary"
sheet["A"][4] = sheet["A"][2] * 12
 ```py sheet = {"A": {}} sheet["A"][1] = "เงินเดือนรายเดือน" sheet["A"][2] = 3000 แผ่น["A"][3] = " เงินเดือนรายปี" sheet["A"][4] = sheet["A"][2] * 12
spam