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William Calvin and Derek Bickerton offer three ways for getting from ape behaviors to syntax. They focus on the transition from simple word association in short sentences (protolanguage) to longer recursively structured sentences (requiring syntax).
SAFi is a lexeme of several groups of languages such as Indo-European, Semito-chamitic, ouralo-altaic and niger-kordofanian. Its distribution consolidates historical linguistic theories of Nostratic or Eurasian roots previous to the Indo-European one (-7000 years).