What letters are at these coordinate a. \( 20^{\circ} 10^{\prime} \mathrm{N}, 71^{\circ} 30^{\prime} \mathrm{W} \) b. \( 20^{\circ} 20^{\prime} \mathrm{N}, 72^{\circ} 00^{\prime} \mathrm{W} \)

I’d be happy to help—but I need a little more context. When you ask “What letters are at these coordinates,” could you clarify what you mean? For example, are these coordinates meant to be read off a special map or grid where certain letters are marked, or do they come from a particular puzzle or challenge? Without knowing the system or context in which “letters” are assigned to locations, it’s hard to tell what is intended by the question. For instance, are you referring to:  • A puzzle where a particular map (or a grid overlay on a map) has letters placed at given latitudes and longitudes?  • A treasure‐hunt or geocaching clue where coordinates point to markers that look like letters?  • Or some other method of encoding letters from numbers (say, using the degree/minute values)? If you can explain a bit more about the source or underlying method for assigning letters to these coordinates, I’ll do my best to assist you further.