521
| Ngwagakete: | Ngwagakete 1 |
|---|---|
| Mengwagakgolo: | Ngwagakgolo 5 – Ngwagakgolo 6 – Ngwagakgolo 7 |
| Mengwagasome: | 490s 500s 510s – 520s – 530s 540s 550s |
| Mengwaga: | 518 519 520 – 521 – 522 523 524 |
521 (DXXI) ebile ngwaga wa go thoma ka Laboraro, ngwaga wa bobedi ngwagengsome wa 520s, ngwaga wa bomasomepedi tee ngwagengkgolo wa Ngwagakgolo 6, le ngwaga wa bomakgolo hlano masomepedi tee ngwagengkete wa Ngwagakete 1.