Listing 22 shows that laufen and lauft return the same results, while the spelling variation laeuft is mapped to the proper spelling lauft, but not to other inflections.

A SNP is a variation in just one nucleotide of a genetic sequence; think of it as a spelling change affecting just one letter in an uncommonly long word.

The rich variation in the spelling of names, in particular, has led to some interesting spell checking algorithms.