640
| Ngwagakete: | Ngwagakete 1 |
|---|---|
| Mengwagakgolo: | Ngwagakgolo 6 – Ngwagakgolo 7 – Ngwagakgolo 8 |
| Mengwagasome: | 610s 620s 630s – 640s – 650s 660s 670s |
| Mengwaga: | 637 638 639 – 640 – 641 642 643 |
640 (DCXL) ebile ngwagamolele wa go thoma ka Laboraro, ngwaga wa pele ngwagengsome wa 640s, ngwaga wa bomasomenne ngwagengkgolo wa Ngwagakgolo 7, le ngwaga wa bomakgolo tshela masomenne ngwagengkete wa Ngwagakete 1.