- Each of A1 and A2 respectively denotes the name of a Middle Eastern country and a well-known Middle Eastern city.
- Similarly, each of B1 and B2 respectively denotes the name of a Middle Eastern country and a well-known Middle Eastern city.
- A1A2 and B1B2 are anagrams of each other
- Each of A1A2 and B1B2 contains precisely 12 letters.
- A2 is not necessarily situated in A1, and B2 is not necessarily situated in B1.
*** Based on a problem appearing in NPR's Sunday Puzzle in 2016.