We can only scan..from what we know.
Lots of methods out there.
According to this Root sum 8 or 1 is near
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Sum Last Digit: Longest out short sums combined...6,7,9
6 0169 0178 0259 0268 0349 0367 0457 1249 1267 1357 1456 2347 2356 2789 3689 4589 4679 5678 0079 1159 1168 2239 2257 3319 3346 4417 4426 5506 5579 6604 6613 6659 7702 7739 7748 8819 8837 8846 9908 9917 9926 9935
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7 0179 0269 0278 0359 0368 0467 1259 1268 1349 1367 1457 2357 2456 3789 4689 5679 0016 0089 1169 1178 2249 2267 3329 3347 3356 4409 4427 4436 5507 5516 5589 6605 6614 6623 6678 7703 7712 7749 7758 8829 8847 8856 9918 9927 9936 9945
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9 0126 0289 0379 0469 0478 0568 1279 1369 1378 1459 1468 1567 2359 2368 2467 3457 5789 0027 0036 1107 1189 2269 2278 3349 3367 4429 4456 5509 5527 5536 6607 6625 6634 6689 7705 7714 7723 7769 8849 8867 9901 9938 9947 9956
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Short sum key digits
sometimes show paired
67xx
79xx
69xx