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| input | output |
|---|---|
| 415-424-4005 XT. 21 | 415-424-4005 XT. |
| 1-800-552-3319 EXT 2606 | 1-800-552-3319 EXT |
| 713-840-9300 X104 | 713-840-9300 X |
| 800-454-1628 OPTION#1 | 800-454-1628 OPTION# |
| +1 (844) SAVE-529 | +1 (844) SAVE- |
| 424-252-4813 (EXT 5013) | 424-252-4813 (EXT ) |
| 1-800-55OAKWELL | 1-800-55OAKWELL |
| +1 (212) 603-2800 (EST) | +1 (212) 603-2800 (EST) |
| remove_digits_after_letters |
|---|
| 415-424-4005 XT. |