I have erased any writing done with a mechanical pencil using an eraser, but please forgive me if I missed anything. I have also erased writing done with a pen using correction fluid, but some marks remain. I have included photos as examples, so please take a look. Also, the spine of the problem set is torn, and I have repaired it with cellophane tape. The name section has been blacked out. I have cut off the writing on the cover, so I have lowered the price. Please understand the above. I welcome purchases from those who understand that this is a used item, has been inspected by a non-professional, and has been stored at home. Please refrain from purchasing if you are overly concerned about the condition.