Reviewing Words: Numbers in Parentheses

General
1

I don’t understand what the numbers in parentheses mean. What do (9) and (10) mean here?

These are articles or YouTube videos I’ve imported into ReadLang.

Thank you!

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2

I think the (9) and (10) are just part of your text titles. e.g. the title of the 2nd text starts with “(9) What Can You…”

3

Ah, I’m starting to get it.

Can you explain how the Length drop-down works? Sometimes the largest quantity changes and I can’t figure out what exactly it’s corresponding to.

Thanks much!