Put explanations in vignettes and restructure them in possibly multiple vignettes.
split funwithdata into general questions, interaction between fractions & explicit topics
未設定截止日期。
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刪除分支是永久的。 此動作無法復原，繼續？
Put explanations in vignettes and restructure them in possibly multiple vignettes.
split funwithdata into general questions, interaction between fractions & explicit topics