Hello Abhijit!

Let me try to explain it: the 0, 1 and 2 define the squares where a group should be put. 0 corresponds to the first square. After a group there should always be an empty square (general rules of black and white monograms), so the 1 doesn't correspond with the second square, but to the third one, because the second square has to be empty.

One other example:

(0, 2, 3) >

0 corresponds to the first square.

2 corresponds to the fourth square, because the second has to be empty, and then we skip another square because the number is 2 (not 1).

3 corresponds to the sixth square, we only skip the square that has to be empty, because 3 directly follows 2.

Maybe even easier:

If the distance is 1 between 2 numbers, there is one empty square between the groups, if the distance is 2, there are two empty squares, and so on...

Hopes this explains it!