Every code is in one of these groups.
The 9 Groups of Codes
Group 1: 147 148 149
Group 2: 157 158 159
Group 3: 167 168 169
Group 4: 247 248 249
Group 5: 257 258 259
Group 6: 267 268 269
Group 7: 347 348 349
Group 8: 357 358 359
Group 9: 367 368 369
===============================
