ఇ అంటే ( ఇ for )

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'ఎ' అంటే ( ఎ for )

'ఒ ' అంటే (ఒ for )

ఓ అంటే ( ఓ for )

అ _ ఇ _ఉ _ఋ ( missing letters )

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_____ఔ (before letter )