pub const GRAY_LUT: [[u8; 3]; 256] = [
[0, 0, 0],
[1, 1, 1],
[2, 2, 2],
[3, 3, 3],
[4, 4, 4],
[5, 5, 5],
[6, 6, 6],
[7, 7, 7],
[8, 8, 8],
[9, 9, 9],
[10, 10, 10],
[11, 11, 11],
[12, 12, 12],
[13, 13, 13],
[14, 14, 14],
[15, 15, 15],
[16, 16, 16],
[17, 17, 17],
[18, 18, 18],
[19, 19, 19],
[20, 20, 20],
[21, 21, 21],
[22, 22, 22],
[23, 23, 23],
[24, 24, 24],
[25, 25, 25],
[26, 26, 26],
[27, 27, 27],
[28, 28, 28],
[29, 29, 29],
[30, 30, 30],
[31, 31, 31],
[32, 32, 32],
[33, 33, 33],
[34, 34, 34],
[35, 35, 35],
[36, 36, 36],
[37, 37, 37],
[38, 38, 38],
[39, 39, 39],
[40, 40, 40],
[41, 41, 41],
[42, 42, 42],
[43, 43, 43],
[44, 44, 44],
[45, 45, 45],
[46, 46, 46],
[47, 47, 47],
[48, 48, 48],
[49, 49, 49],
[50, 50, 50],
[51, 51, 51],
[52, 52, 52],
[53, 53, 53],
[54, 54, 54],
[55, 55, 55],
[56, 56, 56],
[57, 57, 57],
[58, 58, 58],
[59, 59, 59],
[60, 60, 60],
[61, 61, 61],
[62, 62, 62],
[63, 63, 63],
[64, 64, 64],
[65, 65, 65],
[66, 66, 66],
[67, 67, 67],
[68, 68, 68],
[69, 69, 69],
[70, 70, 70],
[71, 71, 71],
[72, 72, 72],
[73, 73, 73],
[74, 74, 74],
[75, 75, 75],
[76, 76, 76],
[77, 77, 77],
[78, 78, 78],
[79, 79, 79],
[80, 80, 80],
[81, 81, 81],
[82, 82, 82],
[83, 83, 83],
[84, 84, 84],
[85, 85, 85],
[86, 86, 86],
[87, 87, 87],
[88, 88, 88],
[89, 89, 89],
[90, 90, 90],
[91, 91, 91],
[92, 92, 92],
[93, 93, 93],
[94, 94, 94],
[95, 95, 95],
[96, 96, 96],
[97, 97, 97],
[98, 98, 98],
[99, 99, 99],
[100, 100, 100],
[101, 101, 101],
[102, 102, 102],
[103, 103, 103],
[104, 104, 104],
[105, 105, 105],
[106, 106, 106],
[107, 107, 107],
[108, 108, 108],
[109, 109, 109],
[110, 110, 110],
[111, 111, 111],
[112, 112, 112],
[113, 113, 113],
[114, 114, 114],
[115, 115, 115],
[116, 116, 116],
[117, 117, 117],
[118, 118, 118],
[119, 119, 119],
[120, 120, 120],
[121, 121, 121],
[122, 122, 122],
[123, 123, 123],
[124, 124, 124],
[125, 125, 125],
[126, 126, 126],
[127, 127, 127],
[128, 128, 128],
[129, 129, 129],
[130, 130, 130],
[131, 131, 131],
[132, 132, 132],
[133, 133, 133],
[134, 134, 134],
[135, 135, 135],
[136, 136, 136],
[137, 137, 137],
[138, 138, 138],
[139, 139, 139],
[140, 140, 140],
[141, 141, 141],
[142, 142, 142],
[143, 143, 143],
[144, 144, 144],
[145, 145, 145],
[146, 146, 146],
[147, 147, 147],
[148, 148, 148],
[149, 149, 149],
[150, 150, 150],
[151, 151, 151],
[152, 152, 152],
[153, 153, 153],
[154, 154, 154],
[155, 155, 155],
[156, 156, 156],
[157, 157, 157],
[158, 158, 158],
[159, 159, 159],
[160, 160, 160],
[161, 161, 161],
[162, 162, 162],
[163, 163, 163],
[164, 164, 164],
[165, 165, 165],
[166, 166, 166],
[167, 167, 167],
[168, 168, 168],
[169, 169, 169],
[170, 170, 170],
[171, 171, 171],
[172, 172, 172],
[173, 173, 173],
[174, 174, 174],
[175, 175, 175],
[176, 176, 176],
[177, 177, 177],
[178, 178, 178],
[179, 179, 179],
[180, 180, 180],
[181, 181, 181],
[182, 182, 182],
[183, 183, 183],
[184, 184, 184],
[185, 185, 185],
[186, 186, 186],
[187, 187, 187],
[188, 188, 188],
[189, 189, 189],
[190, 190, 190],
[191, 191, 191],
[192, 192, 192],
[193, 193, 193],
[194, 194, 194],
[195, 195, 195],
[196, 196, 196],
[197, 197, 197],
[198, 198, 198],
[199, 199, 199],
[200, 200, 200],
[201, 201, 201],
[202, 202, 202],
[203, 203, 203],
[204, 204, 204],
[205, 205, 205],
[206, 206, 206],
[207, 207, 207],
[208, 208, 208],
[209, 209, 209],
[210, 210, 210],
[211, 211, 211],
[212, 212, 212],
[213, 213, 213],
[214, 214, 214],
[215, 215, 215],
[216, 216, 216],
[217, 217, 217],
[218, 218, 218],
[219, 219, 219],
[220, 220, 220],
[221, 221, 221],
[222, 222, 222],
[223, 223, 223],
[224, 224, 224],
[225, 225, 225],
[226, 226, 226],
[227, 227, 227],
[228, 228, 228],
[229, 229, 229],
[230, 230, 230],
[231, 231, 231],
[232, 232, 232],
[233, 233, 233],
[234, 234, 234],
[235, 235, 235],
[236, 236, 236],
[237, 237, 237],
[238, 238, 238],
[239, 239, 239],
[240, 240, 240],
[241, 241, 241],
[242, 242, 242],
[243, 243, 243],
[244, 244, 244],
[245, 245, 245],
[246, 246, 246],
[247, 247, 247],
[248, 248, 248],
[249, 249, 249],
[250, 250, 250],
[251, 251, 251],
[252, 252, 252],
[253, 253, 253],
[254, 254, 254],
[255, 255, 255],
];