Silence (安静) - Structures and others

I have noticed that most of the phrase structures are similar and they tend to repeat.
For example in page 3, we can see one short-short-long phrase. But after that, the phrases repeat themselves (2 by 2). However, this does not make the song boring. I guess it's just for emphasis sake.

Oh yes, another last point would be the omission of 3rds. For instance, in page 1 bar 2, there's only Eb-Bb-Eb, the 3rd which is the G, is missing. And also, in bar 3, the Bb is missing for chord vi. I then recalled Dr. Chong mentioning that the omission of 3rds in composition are relatively acceptable and that it does not spoil the chords' sounds too.

:)