(https://friendstamilchat.in/forum/proxy.php?request=http%3A%2F%2Fi1027.photobucket.com%2Falbums%2Fy338%2Fjimikki%2F1-47.jpg&hash=3c721f11a263591cfc172ea20c1c6df9627976f1)
21 - 11 interlaced dots (Idukku Pulli) Kolam.
(https://friendstamilchat.in/forum/proxy.php?request=http%3A%2F%2Fi1027.photobucket.com%2Falbums%2Fy338%2Fjimikki%2F2-67.jpg&hash=eea240701900fd8e2c7bfba6d93a0ff77e8e07c2)
Start with 21 dots in the center and stop at 11 by 
putting interlaced dots at both sides as shown above
(https://friendstamilchat.in/forum/proxy.php?request=http%3A%2F%2Fi1027.photobucket.com%2Falbums%2Fy338%2Fjimikki%2F3-62.jpg&hash=4ba936932e4b67e0d6bfaa055ea1e42c09d0b5d3)
(https://friendstamilchat.in/forum/proxy.php?request=http%3A%2F%2Fi1027.photobucket.com%2Falbums%2Fy338%2Fjimikki%2F4-35.jpg&hash=2127d11170fd0992f0638e7b5ac7eb1e3e79c132)
Join dots as shown above. Erase the three dots left out
 on all the outer sides. Then put small circle or 
any design around the dots inside the kolam. Fill with desired colour powders.