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There are variations of SAS Length Functions, like LENGTH, LENGTHN, LENGTHC, and LENGTHM. These functions are used to find the length of a character string in SAS, but they work differently in terms of syntax and usage. For example, LENGTH returns the position of the rightmost non-blank character in a string, while LENGTHN returns 0 for a blank or missing string. LENGTHC considers both blank and non-blank characters, and LENGTHM returns the amount of memory allocated for the string.