The first lick shows how the ii-V progression builds tension and releases on the I chord (Cmaj7) in the third bar. The lick climbs and descends a scale leading toward a release on the E note in the third bar. This feeling of release is because the E is a major chord tone (3rd) of the Cmaj7.
The second lick continues the idea of tension and release but adds even more tension in the second bar over the dominant chord (G7). This is because of the altered extensions (in this case the b9, Ab) that are used.
The third lick expands on the second lick using alterations over the dominant chord. This lick adds the #9 (A#) in addition to the b9.
The fourth lick begins with Fmaj7 arpeggio over the Dm7 chord and continues the use of alterations of dominant chord extensions with a b9 and #5 (D#).
The final lick is an ascending scale run leading toward the 5 of the Imaj7 chord. This lick is the most altered sound of the bunch with all the extensions shown in the lesson in one. The scale line uses the b9, #9, and #5 all over the dominant chord before releasing the tension at the Imaj7.