Geminate

I think it might be useful if you could add how to output the diphthongs (with small ya/yu/yo) and geminate consonants (with small tsu).

Near-synonyms: paired, doubled, twinned

For example, Martin (2007) notes that compounds in several languages (including English and Turkish) violate the general phonological principles in the language (e.g., English only allows geminate consonants in compounds).

The attested forms show variation in the unstressed vowels (Srd. lèppere, lèpporo, lèppore, léppuri etc.) but agree on the labial geminate. We can thus reconstruct *leppVr-.