Context: The two different historical Estonian languages (sometimes considered dialects), the North and South Estonian languages, are based on the ancestors of modern Estonians' migration into the territory of Estonia in at least two different waves, both groups speaking considerably different Finnic vernaculars. Modern standard Estonian has evolved on the basis of the dialects of Northern Estonia.

Question: What was the minimum number of waves through which modern Estonians migrated into Estonia?
Answer: two

Question: What are the names of the two separate Estonian languages?
Answer: North and South Estonian languages

Question: What are East and West Estonian languages based on?
Answer: Unanswerable

Question: What evolved from Eastern Estonian dialect?
Answer: Unanswerable

Question: The two waves of migration into Estonian spoke the exact same type of what language? 
Answer: Unanswerable

Question: What was the maximum number of waves through which modern Estonians migrated into Estonia?
Answer: Unanswerable