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a pak že ozubená kolečka a kolca by měla být vždy kulatá ;)
[youtube]WYcqJ5HdxA4?feature=player_detailpage%5c%5c%5c%5c%5c%5c%22%20frameborder=%5c%5c%5c%5c%5c%5c%220%5c%5c%5c%5c%5c%5c%22%20allowfullscreen[/youtube]