Listing things with "a"
When listing nouns belonging to a certain category, 啊 (a) can be added to the end of each noun to give an informal feeling a bit like saying "you know, that kind of thing" after a list of things.
A 啊， B 啊， C 啊⋯⋯
- 我们 什么 零食 都 有，花生 啊，瓜子 啊，薯片 啊，你 随便 吃 吧。We have all sorts of snacks: peanuts, roasted seeds, chips, go ahead and eat whatever you want.
- 椅子 啊，桌子 啊，电脑 啊 什么的 都 买 好 了，现在 办公室 只 差 招 员工 了！Chairs, tables, computers, and so on have all been bought. Now the office only needs to hire workers!
- 《发展 汉语》 啊， 《实用 汉语 课本》 啊，我 都 学 过，没 用！"Developing Chinese" and "The Practical Chinese Reader," we've studied both of them, they won't help.
As in the second example, the list can be followed by 什么的, but is not generally followed by 等 as this feels too formal.