Ḑ or Z

How can you tell whether to use Ḑ or Z in a word?

Both letters in the alphabet have the same sound:

Consonants

But you can tell whether to write it with Ḑ or Z by looking at the letters on either side.

If there is any form of ‘e’ on either side, use Z.

If this condition is not met, always use Ḑ