Elu

Eḷu, also Hela or Helu, is a Middle Indo-Aryan language or Prakrit of the 3rd century BCE. It is ancestral to the Sinhalese and Dhivehi languages. 
R. C. Childers, in the "Journal of the Royal Asiatic Society", states: 
The Pali scholar Thomas William Rhys Davids refers to Eḷu as "the Prakrit of Ceylon".
The Hela Havula are a modern Sri Lankan literary organization that advocate the use of Eḷu terms over Sanskritisms. Eḷu is often referred to by modern Sinhalese as "amisra", Sinhalese for "unmixed".
A feature of Eḷu is its preference for short vowels, loss of aspiration and the reduction of compound consonants found frequently in other Prakrits such as Pali.
Eḷu in comparison with Pali and Sanskrit.
Being a Prakrit, Eḷu is closely related to other Prakrits such as Pali. Indeed, a very large proportion of Eḷu word-stems are identical in form to Pali. The connections were sufficiently well known that technical terms from Pali and Sanskrit were easily converted into Eḷu by a set of conventional phonological transformations. Because of the prevalence of these transformations, it is not always possible to tell whether a given Eḷu word is a part of the old Prakrit lexicon, or a transformed borrowing from Sanskrit.
Compound consonants.
At the beginning of a word only a single consonant can remain
In the middle of a word no group may exceed one consonant