Hi again Stefano,

I was looking at the code and as I'm quite new to both programming and 
Ruby, I can't seem to understand two things. First is the |i| in

> [2, 4, 6, 8, 10, 11, 13, 15, 17, 20, 22, 24, 26, 28, 29, 31,33,35].each 
> do |i|

and second is the ':' in why not just 'black' for example.

>   colors[i] = :black

If you can find the time to tell me what do these do to make the code 
work it would be much apriciated.

Thanks again
Semih
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