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I'm at Hollow Baston, I defeated Riku for the first time, I need to find the four things to unlock the door, where can I find the four things to unlock the door?

Go into the library (to get to the library you need to turn around from where the door is and then come out of the hall then turn to the right. There will be a door. go in the door, and you will be in the library.) and search the book cases and then put them in the right place. then press a purple button on the wall on the second level of the library. Then the door on the second level of the library will be ulocked. Go in the door and try to figure out the rest by yourself. I don't want to give every thing away.