For robustness we might assign a higher edit distance to an add/delete of a letter as compared to a letter substitution. There are "tomato" and "potato" but no

For robustness we might assign a higher edit distance to an add/delete of a letter as compared to a letter substitution. There are "tomato" and "potato" but no "otato" or "omato". Maybe Jerusalem artichoke is known as a sunchoke in the US for a reason, I dunno. :)