### 帰ってきた旧ANA Advent Calendarへようこそ - 2年ぶりに帰ってきたANA修行 Advent Calendarです - ANA修行 Advent Calendar 2017 https://adventar.org/calendars/2168 - ANA Advent Calendar 2018 https://adventar.org/calendars/3031 - ANA Advent Calendar 2019 https://adventar.org/calendars/4225 - 毎…