#include <stdio.h>

int main(void) {
    int i, j;
    printf(" void stepForward(){\n");
    for (i=0; i<4; i++) {
    	if (i)
    		printf("\n");
        for (j=0; j<4; j++)
            printf("  digitalWrite(%d,%d);\n", j+8, (j+4-i)%4<=1); /* alternative: !(j-i)|!((j+3-i)&3) */
        printf("  delay(t);\n");
    }
    printf("}\n");
    return 0;
}