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 Lacue - Eirik Olsen 
Lakal/Saradic 
Languan - durza2111 
Lasa - Mark McGrath 
Latalmish 
Late Nietanian - Gideon O. Ioffe 
Latin 
Latino Moderne 
Latvian 
Leksventin 
Lemurian - Sander Dieleman 
Lesnoraíth - Michael Morgan 
Ley Arah 
Lindenian - Karl Johnson 
Lingua Franca Nova - C. George Boeree 
Liotan - Geoff Eddy 
Lips-Kith - Philip Belben 
Líwd - Andrei 
Loglan 76 
Loglan 95 
Logli - Marcos Cramer 
Logulos 
Lojban 
Low Orkish - OI 
Lûá - Fen Yik 
Luni - Florent Garet 
Lúsiaquia - Stefan Lubbersen 
Lydnevi - Libor Sztemon 
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