chapter 24 Check them one by one!

"I have worked hard to get the list of one hundred people, which is posted below. I hope everyone can work together to find the mysterious person among them."

"Two options are now eliminated. First, it can be proven that he was not present at the playground the night before yesterday."

"Second. It was proven that the mysterious man was not at the scene when he appeared this morning."

"Students of the people on these lists are asked to think about whether...