Mistake in Tips and notes Verbs: Present 1
In the section of Tips and Notes belonging to the unit Verbs: Present 1 it says:
" In addition, when a verb stem ends in -s, second and third person plural forms will look the same:
lesen (to read) — du liest, er liest This is because the -s- from du …-st and the -s from the verb stem merge".
I think there is a mistake: it is the second and third person singular, not the plural ones, as the examples who come right after show.