title: How to get a element to stick to the bottom-right corner in Tkinter?
body: <p>I put button on a frame like this in Tkinter for python3:</p>
  
  <pre><code>b2_1 = Button(frame1, text='aaaaaaaaaaaa')
  b2_1.pack(pady=20, side=RIGHT)
  
  b2_2 = Button(frame1, text='bbbbbbbbbbbbbbb')
  b2_2.pack()
  </code></pre>
  
  <p>I want the buttons b2_1 and b2_2 to be stick not only to the right side, but also to the bottom, one right above another. 
  How can I do that? </p>