# Recommendation F.30 (11/1988): Use of various sequences of combinations for special purposes

> superseded recommendation/international standard from the International Telecommunication Union

**Wikidata**: [Q27051340](https://www.wikidata.org/wiki/Q27051340)  
**Source**: https://4ort.xyz/entity/recommendation-f-30-11-1988-use-of-various-sequences-of-combinations-for-special-purposes