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Given a character vector, for each of its elements, check the validity of the Greek Tax Identification Number (AFM).
afm_check(v)
A logical vector.
a character vector for whose elements validity of AFM is checked.
afm_check("BADAFM999") afm_check("123456789") afm_check("12345678") afm_check("123456783") afm_check(c("123456789", "111111116"))
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