http://www.as8.it/type/basic_kerning_text.html
http://practicalcryptography.com/media/cryptanalysis/files/english_bigrams_1.txt
https://typefacts.com/artikel/kerningtest
https://web.archive.org/web/20050926082530/http://www.sudtipos.com.ar/test01.txt
https://web.archive.org/web/20050329080256/http://www.sudtipos.com.ar/test02.txt
https://web.archive.org/web/20050329081130/http://www.sudtipos.com.ar/test03.txt