On a website about my home state of Colorado, it lists Arizona as bordering it (at the CO/UT/AZ/NM Four Corners point).
But for purposes of map coloring, they aren’t considered bordering. Otherwise, the 4CMT would fail if you have 5 or more states meeting at a corner.
So, do Colorado and Arizona (or Utah and New Mexico) border each other or not?
Everybody got to elevate from the norm - Rush