Now I know my ABCs, won't you come and golf with me? Write a program or function that outputs this exact text, case-insensitive:

A, B, C, D, E, F, G,
H, I, J, K, L, M, N, O, P,
Q, R, S,
T, U, V,
W, X, Y, Z.


(Based on the alphabet song that many American kids learn to help memorize the alphabet, though edited for more compressibility.)

The output must look exactly the same as the above (again, case-insensitive), but may contain trailing spaces on each line and/or trailing newlines. Notice the period at the end.

This is code-golf, so the shortest code in bytes wins.
Vim, 42, 40 keystrokes/bytes
:h&lt;_&lt;cr&gt;jjYZZP:s/./&amp;, /g&lt;cr&gt;7f r&lt;cr&gt;9;.3;.3;.$ch.

Thanks to Lynn and her awesome vim answer for the tip to grab the alphabet from help.
Thanks to RomanGräf for saving two bytes!
Explanation:
:h&lt;_&lt;cr&gt;                                      &quot; Open up vim-help
        jj                                    &quot; Move down two lines
          Y                                   &quot; Yank this line (containing the alphabet)
           ZZ                                 &quot; Close this buffer
             P                                &quot; Paste the line we just yanked
              :s/./&amp;, /g&lt;cr&gt;                  &quot; Replace every character with that character followed by a comma and a space
                            7f                &quot; Find the seven space on this line
                               r&lt;cr&gt;          &quot; And replace it with a newline
                                    9;        &quot; Repeat the last search (space) 9 times
                                      .       &quot; Repeat the last edit (replace with a newline)
                                       3;     &quot; Third space
                                         .    &quot; Replace with newline
                                          3;  &quot; Third space
                                            . &quot; Replace with newline

Then, we move the end of the of the line with $, change back a character with ch and insert a dot.