If you want to check the set of URLs then use this program. Write a list of Stichwörter. then run this program. The program show you the set of files with this search string.

This program will be useful for SEO optimization. If you want to build a text you need to download the text from internet. Then check the texts. Does this text contain Stichwörter you are want. Then mix the text and to build new texts.