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.

The structure of grinding wheels can realize high point grinding, and the good grinding equiprobability lies on a proper spinning speed and the random variation of the spinning axis.

It is a common speech phenomenon that the proper name makes a variation. It can receive positive rhetoric effect by using appropriately, so it is used regularly.