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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suān, suán, suǎn, suàn

first tune

suān

sour; acid 酸 suān

muscular pains aching of limbs 痠 suān

fourth tune

suàn

garlic 蒜 suàn

count; compute; calculate 算 suàn