problem in pointer to pointers

[geeta719]

#include<stdio.h>
char *c[]={“ENTNG”, “NST”,”AMAZI”,”FIRBE”};
char** cp[]={c+3, c+2, c+1, c};
char ***cpp= cp;
void main() {
printf(“%s”,**++cpp);
printf(“%s “,*--*++cpp+3);
printf(“%s”,*cpp[-2]+3);
printf(“%s”,cpp[-1][-1]+1);
}

how to solve this *cpp[-2]+3 ??
what does [-2] here means??

[newb16]

at this moment, cpp was advanced to point to cp[2], so cpp[-2] points to cp[0] that holds value c+3, pointer to "FIRBE".