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| English | Thesaurus |
| Common filename extension | 000 |
| external extension number | external ext number (ssn) |
| LAN Resource Extension and Services | LANRES |
| Life Extension Services | LES (Yuriy Melnikov) |
| Multipurpose Internet Main Extensions Object Security Services | MOSS |
| Service Life Extension/Enhancement Program | SLEP (USA) |
| Ship Life Extension Programme | SLEP (UK) |