4O
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Look up 4o in Wiktionary, the free dictionary.
4O or 4-O may refer to:
- Quarto (4° or 4o), a format of a book
- 4 Degrees and Beyond International Climate Conference, 2009
- Quaternary sector of the economy (4o Sector)
- Air Montenegro (IATA code: 4O), the flag carrier of Montenegro
- Interjet (former IATA code: 4O), a former Mexican airline
- 2007 Rally d'Italia Sardegna (4º Supermag Rally Italia Sardinia)
See also[edit]
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