Khmer consonant

The 33 of Khmer consonants are divided into two series:

First series sound "OR" and Second series sound "O"

ក       ខ        គ        ឃ        ង

ច       ឆ        ជ        ឈ       ញ

ដ       ឋ        ឌ        ឍ       ណ

ត       ថ        ទ        ធ        ន

ប       ផ        ព        ភ        ម

យ      រ        ល       វ         ស

ហ       ឡ       អ