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:
300 (1 )
300
() 30 (1/3 )
1
1
,
1/2 .
https://www.youtube.com/watch?v=laFtAGK_yQ8&li...EMnrcHAI4Wg-I7EX7Tz50Vz8Wc6715
https://www.youtube.com/watch?v=UttY15vRki8&li...EMnrcHAI6MDyBxlSp8WAsU9W2rmI8g
: | / |