5 Aryan Tribes

Cologne Sanskrit Dictionary under kRSTi perhaps originally designating the five Aryan tribes of the Yadus , Turvasas , Druhyus , Anus , and Purus , comprehends the whole human race , not only the Aryan tribes) RV. AV.
Another of the early races were the Kurus. The first letters of these tribes co-incide with basic divisions of Sanskrit.
Anus Turvasas Purus Yadus Kurus   Druhyus
A                                                   K 
           T               P         Y                         D
A  K  T  P  
A  Ka Ta Pa Ya Da
ka-Ta-pa-ya Scheme
Katapayadi system