Suddenly back to basics

Volume 2 starts as easy as volume 2. I'll take the opportunity to remind the general gist of these exercises:
Exercises divided in halves: ascend along the keyboard as you play, then descend back to the beginning.
The exercise is mastered once played at the highest tempo (usually 108 beats per minute (BPM))
Fingers are numbered from the thumb (1) to the pinky (5)
Right hand is mapped to the Sol staff (aka G staff)
Left hand is mapped to the Fa staff (aka F staff)

This exercise is exactly like exercise 1, except it has you play five extra notes at the beginning, going up and then down again with RHF1-2-3/LHF5-4-3 and only then jumping with RHF2/LHF4. Same thing on the way down. The only difficulty I had was that the melody is so similar to exercise 1 that I'd begin playing it instead of doing the little combination that this exercise appends to its beginning. Rather than training or easing you into a new realm of finger dexterity, this exercise is more about honing your self-control.

Having come from exercise 20, I was expecting something equally difficult and was left feeling equal parts disappointed and relieved. Doing this exercise after all of that feels like coming back to the place your journey first began as a stronger, more capable adventurer. I wonder if Hanon intentionally placed this exercise here to serve as a morale boost.

Notice that there's more musical notes per measure as compared to the exercises on volume 1, but the tempo is the exact same. Notice that to the right of each staff there is another mark. It indicates how many beats each measure is made of. In this case, it's made of four quarter notes. There's sixteen notes on each measure, meaning each note is a sixteenth. Four sixteenths make a quarter. Maths! Music theory! A concept I've learned and unlearned for years now properly setting in my mind. Practice does make perfect.