Grasshopper

algorithmic modeling for Rhino

This is my first post, so hello everyone!

I've been playing with grasshopper for a while, but I still can't understand some basic stuff. So sorry if my questions are too simple, but I can't find any info about it.

I have created a 3d voronoi inside a box and now I want to get rid of all cells on the corners. My idea is to set a threshold (let say 10), and to delete those cells which lies closer than threshold (10 units) from corner points. Of course I can cull those cells when I find the indexes manually, but it's not the point. I just want to know how to manage such operations. 

oh and there is one more question - how do I measure the distances? The best way would be to measure the distance between corner points and cells centers, but I don't know how to find these centers. 

I will appreciate any help

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well, I just found the solution myself, so sorry for creating useless thread. Anyway I post the definition, so that anyone with the same problem can look how I did this. I don't think this is the best way to do it though.

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