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array(4) { [0]=> int(6) [1]=> int(4) [2]=> int(4) [3]=> int(1) } (6-1)*4+4 = 24 array(4) { [0]=> int(8) [1]=> int(2) [2]=> int(6) [3]=> int(1) } (8 / 2) * (6 / 1) = 24 array(4) { [0]=> int(6) [1]=> int(8) [2]=> int(8) [3]=> int(2) } 6+8+8+2 = 24