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Susie Dent (@susie_dent) on X

English has an ancient law: in words like 'chit chat', 'zigzag', and 'seesaw', we always put the part with an i (as in 'pit') or e (as in 'be') first. We instinctively know this rule of 'ablaut reduplication'. You can't have a pair of flop flips or jamjims, or play pong ping.