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Принцип образования буковъ
1 ч. https://www.youtube.com/watch?v=jIYxSiqrFME
2 ч. https://www.youtube.com/watch?v=CvIiz0k9rEs
3 ч. https://www.youtube.com/watch?v=tBZRKREvxZA
4 ч. https://www.youtube.com/watch?v=7BHiUlRaIQA
Принцип образования буковъ
1 ч. https://www.youtube.com/watch?v=jIYxSiqrFME
2 ч. https://www.youtube.com/watch?v=CvIiz0k9rEs
3 ч. https://www.youtube.com/watch?v=tBZRKREvxZA
4 ч. https://www.youtube.com/watch?v=7BHiUlRaIQA