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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tuān, tuán, tuǎn, tuàn

first tune

tuān

rushing water; rapidly flowing 湍 tuān

second tune

tuán

group; round mass 團 tuán

unify; unity 團結 tuán jié
group 團 tuán	connect 結 jié

round mass dumpling (rice flour) 糰 tuán

rice balls; onigiri 飯糰 fàn tuán
cooked rice 飯 fàn	round mass 糰 tuán

Chinese characters also pronunced tuán