As ES is a PPSS conlang so it is made of 7 Petsks: P, T, Z, K, L, N, and I.
but you may find the following Alphabets in the modern form:
P: /p/, /b/, /v/
T: /t/, /d/
Z: /s/, /z/
K: /k/, /g/
L: /r/, /l/, /y/
N: /m/, /n/
I: /a/, /e/, /o/, /i/, /u/
totally there are 14 consonants and 5 vowels = 19 roman letters in its modern representation.
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