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pub const ALPHABETS: [char; 26] = [ 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', ]; pub const DIRE: [(isize, isize); 4] = [(1, 0), (0, 1), (-1, 0), (0, -1)]; pub const DIRE8: [(isize, isize); 8] = [ (1, 0), (1, 1), (0, 1), (-1, 1), (-1, 0), (-1, -1), (0, -1), (1, -1), ];