Singing Grace before Meals in Gregorian Chant - Benedictiones mensae ante prandium

The booklet I'm taking clips from is here:
https://gregorio-project.github.io/examples/benedictiones/benedictiones.pdf
But I'm not following it very closely.
And here is an article about the booklet and where you can buy it:
https://www.newliturgicalmovement.org/2011/05/norcia-republishes-chanted-latin-table.html