[...]
Because of its small phoneme inventory, Toki Pona allows for quite a lot of allophonic variation. For example, /p t k/ may be pronounced [b d ɡ] as well as [p t k], /s/ as [z] or [ʃ] as well as [s], /l/ as [ɾ] as well as [l], and vowels may be either long or short.[10] Both its sound inventory and phonotactics (patterns of possible sound combinations) are found in the majority of human languages and are therefore readily accessible.
[...]

http://self.gutenberg.org/articles/Toki_Pona

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