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Conventions used
DDA – U+0D22
NNA – U+0D23
RRA – U+0D31
Virama – U+0D4D
We are looking at the issues of writing a text in an old orthography font and reading it in new orthography and vice versa. Specifically, we are looking at the possibility of any Chillu-C1 + C2 sequence forming conjuncts in this mixed context.
There is no General rule for conjunct formation
Argument is through examples:
Uniqueness Rule Violation
I agree that there could be a Chillu-conjunct formation rule for a proper subset of Chillu-C1 + C2 permutations. Even then, due to Uniqueness Rule, we cannot allow Chillu-C1 + C2 and C1 + VIRAMA + C2 forming same conjunct.
This has a side effect: Many words like /alpam/ can potentially have two spellings - one with chillu-LA (
So, only C1 + VIRAMA + C2 forms the conjunct.
Exceptions?
Please see discussions on Malayalam eyelash-repha and on /nta/.