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This looks great but how to type "Nee"ngal,is there any site where i can learn how to form phrases

Ta opinia jest o wcześniejszej wersji dodatku (0.4.1.1-signed.1-signed). 

The extension is designed to automatically detect and use the ந when you start a sentence or a word (by typing small 'n' after a space). In case if its not detecting automatically, you can use small 'w' to type the ந