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Don't ask the question in the title. Also, provide more information.

Your question is equvalent to asking "Why does this equation use 5: 5x^2 + 2x + 3 = 7?".

I'm assuming that this is for a cashe implementation? The reason why it has 4 select inputs is because it wouldn't work otherwise. If you used 3, then you're obviously missing a place where a hit could be found. Though I probably wouldn't impement it as described.

Edited by Hiroshe