Question: Cover Group For Memory

Hi All,

I have a 4 KB memory and wanted to write a cover point for all the memory locations whether (READ) has been performed on all the locations or not.

Need some ideas to do the same.

I think if you can cover bit flip position that is more than enough.
Like if you have 4 bit width x8bit depth memory.
cover points as ???1, ??1?, ?1??, 1???, 0000, 1111 is enough.
any comments?