I suppose if we needed more than that, we could continue going through the psalm assigned to that antiphon.
The website https://bbloomf.github.io/jgabc/propers.html will supply numerous extra verses for the Introit and Communio. One has to select the checkbox "Verses ad libitum", and the generator appears to supply the correct psalm from the Graduale Romanum (OF) or Offertoriale and Versus Psalmorum et Canticorum (EF). One can also choose the psalm (or canticle) and verses.
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