How to identify combined Hindi letter (combined glyph) in NSString?

[pepeek]

Hindi language has so called combined glyphs which means that two letters in the alphabet combined together creates one "logical" letter which is read/understood as one. Such combined letter is however in NSString represented as two separate chars.

Now, is there a way to tell which character in NSString belongs to combined letter and which one is just a single one? I need to break down one hindi word into logical letters for my "crossword-like" game.

For example this hindi word लड़का has 3 hindi letters: one single and two combined. This word in in NSString represented by 5 characters. I need to break this down and get the three logical/real letters.

Thanks in advance for your help,
--Josef