#include<stdio.h>
#include<stdlib.h>
int main()
{
    // a is a 20x20 2D array of chars
    char (*a)[20]=calloc(20, sizeof(char[20]));
    strcpy(a[0], "abcd");
    strcpy(a[1], "wxyz");
    printf("%s\n",a[0]);
    printf("%s\n",a[1]);
    return 0;
}