In a natural language subset, the point names are defined as the quotation of a single symbol, line names are defined as the names of lines are defined as the juxtaposition of two symbols, names of triangles are defined as the juxtaposition of three symbols, and so on, up to the case of octagons. No repetitions are allowed symbols. Design and implement a Flex program that analyzes proposals of of the form "triangle BCD", "square BCDA", and so on, and accept only the correct definitions. Examples of incorrect definitions are "square AB", "triangle AAD", "angle BC". Accepted programming languages: FLEX in a combination with C/C++.

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