A careful examination of the clues in today's mentalfloss.com Brain Game Think Thursday challenge should provide the answer. Good luck!

What do the names of these U.S. states
have in common that no others  do?

Alabama, Alaska, Hawaii, Indiana, Iowa,
Kansas, Mississippi, Tennessee, Utah

Here is the ANSWER.

ANSWER:

Each name contains exactly 4 different letters of the alphabet.

Thanks for playing! Tomorrow, it's Free-for-all Friday.