本文探讨了如何在不同条件下书写和标记文字，包括纸张性质、使用工具和技巧，以及字母数量限制。
1. if it is white
2. if it could be erased
3. if it could be written with a marked pen
4. how many letters could I write
5. is that clear to show the character
6. how much pressure do I need to write a word
7. how much pressure do I need to erase a word
8. if the marker pen is the only one which could write stuff on it, how about pencil
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