The levenshtein
command computes the Levenshtein distance between two words, which is the
minimum number of single-character edits (insertions, deletions or substitutions)
required to change one word into the other.
levenshtein takes two arguments:
s1, a vector or string.
s2, a vector or string.
levenshtein(s1,s2)
returns the minimum number n of edits required to transform s1 into s2.