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* '''#sq''' - index of that square in the 0..63 range
* '''premask''' - the mask to get all relevant occupied bits, considering the [[First Rank Attacks#TheOuterSquares|inner six bits]].
* '''bits''' - the [[Population Count|population count]] of premask
* '''used''' - hopefully less than '''bits''', determines the '''shift''' (64 - '''used''')
* '''magic''' - the magic factor
