Numberblocks - Nine -Welsh- "Blociaurhif" (Naw)
Numberblocks is a show about math blocks, the episode Nine was dubbed in Welsh, but was lost.
UPDATE: on June 22, 2020: S4C re-aired the episode and then found as June 15, 2020. it can be viewed by clicking the video on the right
However. LDS Family blocked it in some countries, making the episode lost again for some viewers.
Luckily, the video was re-uploaded to Gofile, you can now view it worldwide here: https://gofile.io/d/PRZGn0