The five Japanese vowels and your first four greetings.
あいうえお a i u e o · こんにちは konnichiwa · おはようございます ohayou gozaimasu · こんばんは konbanwa · ありがとうございます arigatou gozaimasu · さようなら sayounara
Source: JLPT N5 level summary (https://www.jlpt.jp/e/about/levelsummary.html).
Aligned to the JLPT N5 level description. Not affiliated with or endorsed by the Japan Foundation or Japan Educational Exchanges and Services (JEES), the organizers of the Japanese-Language Proficiency Test.