This outline, however, has many exceptions. CB 122–134, which are categorized as love songs, actually are not: they contain a song for mourning the dead, a satire, and two educational stories about the names of animals. Another group of spiritual poems may have been included in the "Carmina Burana" and since lost. The attached folio contains a mix of 21 generally spiritual songs: a prose-prayer to Saint Erasmus and four more spiritual plays, some of which have only survived as fragments. These larger thematic groups can also be further subdivided, for example, the end of the world (CB 24–31), songs about the crusades (CB 46–52) or reworkings of writings from antiquity (CB 97–102).