The following video demonstrates each syllable of the pinyin structure
and the exercise of pinyin/zhuyin with basic Chinese 4-tune pronunciation

Mandarin pinyin tunes
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cōu, cóu, cǒu, còu

fourth tune

còu

gather; collect; pool together 湊 còu

pool money; club together; raise fund 湊錢 còu qián
pool together 湊 còu	money 錢 qián

Chinese characters also pronunced còu