Proto-Slavic *a

→ Czech a (derived)

→ Old Church Slavonic а (inherited)

→ Lithuanian o (cognate)

→ Macedonian а (inherited)

→ Old East Slavic а (inherited)

→ Polish a (inherited)

→ Polabian ă (inherited)

→ Russian а (inherited)

→ Serbo-Croatian а (inherited)

→ Serbo-Croatian a (inherited)

→ Slovak a (inherited)

→ Old Novgorodian а (inherited)