original: The petitions at the end of the hymn (beginning Salvum fac populum tuum) are a selection of verses from the book of Psalms, appended subsequently to the original hymn.
simplifications: The petitions at the end of the hymn are a selection of verses from the book of Psalms, added later to the original hymn. The parts at the end of the hymn (starts with Salvum fac populum tuum) are verses that were picked from the book of Psalms, and then added to the original hymn. Words at the end of the hymn are a from the book of Psalms. The petitions at the end of the hymn are selections of verses from Psalms appended to the original. The repetitions come from Psalms. They are at the end of the hymn. The petitions at the end of the hymn (beginning Salvum fac populum tuum) are verses from the book of Psalms. They were later attached to the original hymn. The petitions at the end of the hymn are verses from the book of Psalms that were added to the original hymn. The petitions at the hymn's end are a selection of verses from the book of Psalms. They were added to the original hymn. The request at the end of the song (start of Salvum fac populum tuum), are parts from the book of Psalms, added afterward to the first hymn. The protests at the end of the hymn (beginning with Salvum fac populum tuum) are a selection of verses from the book of Psalms, which are then annexed to the original hymn.