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Saraveca is an extinct Arawakan language once spoken in Bolivia by the Sarave. It is said to be the only language with a numeral system based exclusively on five, although quinary systems exist. To some extent this is also an areal feature of other South American languages; many form their numbers 6–9 as "five + one", "five + two" and so on.
References
Wells, David (1997). The Penguin Dictionary of Curious and Interesting Numbers. Penguin UK. ISBN978-0-14-026149-3.
