#include <stdlib.h>
#include <stdio.h>
int main() {
    char **last_names;
    // Assign a dynamically allocated char * array of length 4 to last_names. 
    // Then, allocate a character array of length 20 for each element of the array 
    // pointed to by last_names.
    return 0;
}
    // Assign a dynamically allocated char * array of length 4 to last_names. 
    // Then, allocate a character array of length 20 for each element of the array 
    // pointed to by last_names.