Are the Hiragana characters ぢゃ, ぢゅ, and ぢょ (still) used?


I am learning Hiragana, and I pulled a couple of charts off the internet to
use as study aids. One of them has the line of characters ぢゃ, ぢゅ, and ぢょ, but
they are not in the other chart.

Are these characters a mistake? Are they still used? Are they deprecated?




They are possible in [rendaku](https://en.wikipedia.org/wiki/Rendaku), as a
result of voicing ちゃ, ちゅ, ちょ:

  * いろ + ちゃや = いろ **ぢゃ** や
  * ぼん + ちょうちん = ぼん **ぢょ** うちん

In other cases, though, じゃ, じゅ, じょ are normally used for _ja/ju/jo_.

