Используемый материал взят с интернет сайтов: http://images.yandex.ru/yandsearch?stype=image&lr=11453&noreask=1&text=%D0%BE%D0%B1%D0%BB%D0%BE%D0%B6%D0%BA%D0%B0%20%D0%BA%D0%BD%D0%B8%D0%B3%D0%B8%20%D0%BD%D0%BE%D0%B2%D1%8B%D0%B5%20%D0%BF%D1%80%D0%B8%D0%BA%D0%BB%D1%8E%D1%87%D0%B5%D0%BD%D0%B8%D1%8F%20%D0%BA%D0%BE%D0%BB%D0%BE%D0%B1%D0%BA%D0%B0&nojs=1http://images.yandex.ru/yandsearch?text=%D0%BA%D0%B0%D1%80%D1%82%D0%B8%D0%BD%D0%BA%D0%B8%20%D0%BA%20%D1%81%D0%BA%D0%B0%D0%B7%D0%BA%D0%B5%20%D0%BA%D0%BE%D0%BB%D0%BE%D0%B1%D0%BE%D0%BA&stype=image&lr=11453&noreask=1&nojs=1http://images.yandex.ru/yandsearch?p=2&text=%D0%BA%D0%B0%D1%80%D1%82%D0%B8%D0%BD%D0%BA%D0%B8%20%D1%84%D0%BE%D0%BD%D1%8B%20%D0%BA%20%D1%81%D0%BA%D0%B0%D0%B7%D0%BA%D0%B0%D0%BC&lr=11453&noreask=1&nojs=1&rpt=image