Angelina and her friends formed a club named the Extremely Cool Club. They wanted to assign a unique 4-digit secret code number to each member of the club. They decided to use the digits 1, 3, 7, and 9 for their numbering system and each of these digits can appear only once in every secret code number (i. e. 1379 is a valid number, but 1133 is not a valid number). What is the maximum number of members who could join the club if everyone is to be assigned a unique secret code number?
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