Myanmar Unicode - ya-yit

Since mystery of ya-yit in “myanmar1” font I discussed fascinated me, I tried to find the ya-yit in character set of myanmar1. Eventually I found that there is no ya-yit at all. Instead, “Ya” and “a-thet” combined to form ya-yit. Like this: for “kya” and “cha”, က   ္   ရ ခ   ္   ရ. I put spaces between these characters to split them. If I remove spaces, they combined again to render as ya-yit. 
Now, getting more mysterious.

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