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Messier 21
[af] Messier 21
[ar] مسييه 21
[ast] Cúmulu abiertu M21
[az] NGC 6531
[be] M21 (аб’ект Месье)
[be-x-old] M21
[bg] M21
[bs] Messier 21
[ca] Messier 21
[ce] NGC 6531