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l1 = tk.Label(my_w, text='First', width=20)
l1.grid(row=1,column=1)
l2 = tk.Label(my_w, text='Second', width=20)
l2.grid(row=1,column=2)
l3 = tk.Label(my_w, text='Both First and Second, columnspan=2')
l3.grid(row=2,column=1,columnspan=2)