ืื ืืืืืช ืืงืื ื'ืื ืืืื ืืืืคืจืคืื ืืืืืืงืืช โ ืืื ืืืื ื ืืจืื B2. ืกื ืคืจืืืืื ืืืฉืจืืืื ืืืืื ืืืืืงืืช.
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