I noticed that In Orberg’s LLPSI he introduces the word volunt in chapter 10 but I can’t find it or any variant of it in the vocabulary at the back… I know it’s volo, velle, volui… I reckon he saw that he had volo, volari, volavi, volatum when checking the vocab list and forgot to include volo, velle, volui… though I see he explains it on page 72…