I was looking up "seesaw" on Wiktionary"seesaw" on Wiktionary , and I noticed all their examples of ablaut reduplication "such as teeter-totter, zigzag, flip-flop, ping pong, etc." have "ee" or "i" in the first word, replaced by "o" or "a" in the second word:
- seesaw
- teeter-totter
- zigzag
- flip-flop
- ping pong
- sing-song
- kitty-cat
Is there a process by which this kind of reduplication that involves only a vowel change ensures that the first vowel is front/close and the second vowel is back/open?