fun fact from Merriam Webster

[lauradi7dw]

Hey ding-dongs, let’s have a chit-chat about Ablaut reduplication.

If you have three words, the order usually goes 'I-A-O.'
-tic-tac-toe

If there are only two words, ‘I’ is the first and the second is either ‘A’ or ‘O.’
-click-clack
-King-Kong