| CUSIP # 902685106 | Page 1 0 of 10 |
EXHIBIT A
Agreement of Joint Filing
The undersigned hereby agree that a single Schedule 13G (or any amendment thereto) relating to the Common Stock of the Issuer shall be filed on behalf of each of the undersigned and that this Agreement shall be filed as an exhibit to such Schedule 13G.
Date: February 11, 2022
| MIH Edtech Investments B.V. | ||
| By: | /s/ Serge de Reus | |
| Name: | Serge de Reus | |
| Title: | Director | |
| Prosus N.V. | ||
| By: | /s/ Vasileios Sgourdos | |
| Name: | Vasileios Sgourdos | |
| Title: | Executive Director | |
| Naspers Limited | ||
| By: | /s/ Vasileios Sgourdos | |
| Name: | Vasileios Sgourdos | |
| Title: | Executive Director | |
