I am going to show a sample, if you filter out:
HHL
OOO
IOO
From the source of 1000 numbers you get:
671 Straight pick 3 numbers:
It is not a lot of filtration, but it is only 3 filters and 1 pattern from each of them, that is why there are also other filters that can be used, such as digits, pairs, widths, sums, LDRs, roots, Etc.
012, 013, 014, 015, 016, 017, 018, 019, 021, 023, 024, 025, 026, 027, 028, 029, 031, 032, 034, 035, 036, 037, 038, 039, 041, 042, 043, 045, 046, 047, 048, 049, 051, 052, 053, 054, 056, 057, 058, 059, 061, 062, 063, 064, 065, 067, 068, 069, 071, 072, 073, 074, 075, 076, 078, 079, 081, 082, 083, 084, 085, 086, 087, 089, 091, 092, 093, 094, 095, 096, 097, 098, 102, 103, 104, 105, 106, 107, 108, 109, 120, 123, 124, 125, 126, 127, 128, 129, 130, 132, 134, 136, 138, 140, 142, 143, 145, 146, 147, 148, 149, 150, 152, 154, 156, 158, 160, 162, 163, 164, 165, 167, 168, 169, 170, 172, 174, 176, 178, 180, 182, 183, 184, 185, 186, 187, 189, 190, 192, 194, 196, 198, 201, 203, 204, 205, 206, 207, 208, 209, 210, 213, 214, 215, 216, 217, 218, 219, 230, 231, 234, 235, 236, 237, 238, 239, 240, 241, 243, 245, 246, 247, 248, 249, 250, 251, 253, 254, 256, 257, 258, 259, 260, 261, 263, 264, 265, 267, 268, 269, 270, 271, 273, 274, 275, 276, 278, 279, 280, 281, 283, 284, 285, 286, 287, 289, 290, 291, 293, 294, 295, 296, 297, 298, 304, 305, 306, 307, 314, 316, 324, 325, 326, 327, 340, 341, 342, 345, 346, 347, 348, 349, 350, 352, 354, 356, 358, 360, 361, 362, 364, 365, 367, 368, 369, 370, 372, 374, 376, 378, 384, 385, 386, 387, 394, 396, 403, 405, 406, 407, 413, 415, 416, 417, 423, 425, 426, 427, 430, 431, 432, 435, 436, 437, 438, 439, 450, 451, 452, 453, 456, 457, 458, 459, 460, 461, 462, 463, 465, 467, 468, 469, 470, 471, 472, 473, 475, 476, 478, 479, 483, 485, 486, 487, 493, 495, 496, 497, 503, 504, 506, 507, 514, 516, 523, 524, 526, 527, 530, 532, 534, 536, 538, 540, 541, 542, 543, 546, 547, 548, 549, 567, 568, 569, 576, 578, 586, 587, 596, 603, 604, 605, 607, 613, 614, 615, 617, 623, 624, 625, 627, 630, 631, 632, 634, 635, 637, 638, 639, 640, 641, 642, 643, 645, 647, 648, 649, 657, 658, 659, 675, 678, 679, 685, 687, 695, 697, 703, 704, 705, 706, 714, 716, 723, 724, 725, 726, 730, 732, 734, 736, 738, 740, 741, 742, 743, 745, 746, 748, 749, 756, 758, 765, 768, 769, 785, 786, 796, 801, 802, 803, 804, 805, 806, 807, 809, 810, 812, 813, 814, 815, 816, 817, 819, 820, 821, 823, 824, 825, 826, 827, 829, 830, 831, 832, 834, 835, 836, 837, 839, 840, 841, 842, 843, 845, 846, 847, 849, 856, 857, 859, 865, 867, 869, 875, 876, 879, 895, 896, 897, 901, 902, 903, 904, 905, 906, 907, 908, 910, 912, 914, 916, 918, 920, 921, 923, 924, 925, 926, 927, 928, 930, 932, 934, 936, 938, 940, 941, 942, 943, 945, 946, 947, 948, 956, 958, 965, 967, 968, 976, 978, 985, 986, 987
001, 002, 003, 004, 005, 006, 007, 008, 009, 010, 011, 020, 022, 030, 033, 040, 044, 050, 055, 060, 066, 070, 077, 080, 088, 090, 099, 100, 101, 110, 112, 114, 116, 118, 121, 122, 141, 144, 161, 166, 181, 188, 200, 202, 211, 212, 220, 221, 223, 224, 225, 226, 227, 228, 229, 232, 233, 242, 244, 252, 255, 262, 266, 272, 277, 282, 288, 292, 299, 303, 323, 330, 332, 334, 336, 338, 343, 344, 363, 366, 383, 404, 414, 424, 433, 434, 440, 441, 442, 443, 445, 446, 447, 448, 449, 454, 455, 464, 466, 474, 477, 484, 494, 505, 525, 544, 545, 556, 558, 565, 566, 585, 606, 616, 626, 633, 636, 644, 646, 655, 656, 665, 667, 668, 669, 676, 677, 686, 696, 707, 727, 744, 747, 766, 767, 776, 778, 787, 800, 808, 811, 818, 822, 828, 833, 838, 844, 848, 855, 858, 866, 868, 877, 878, 885, 886, 887, 889, 898, 899, 900, 909, 922, 929, 944, 949, 966, 969, 988, 989, 996, 998
000, 222, 444, 666, 888
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If I could also use there 1 pattern from the Bala-Nced filter maybe the produced numbers might have been 600 or fewer and that would have been at least 40% reduction of the full source of numbers using just 4 patterns.