The high notes in example 421 are the same intervals as just outlined. However this time these notes are played simultaneously as double stops. The low notes are mainly Bb (root) and F (5th). The combination of the two hands create the different chord types as indicated above the music stave. Let all notes ring as a full chord. In the last bar the right hand plays three notes as a block chord.
Example 422 uses both hands simultaneously which creates the chord voicings written next to the music. As already mentioned earlier when playing chords, sometimes the fifth (5th) can be omitted without loosing the essence of the chord. All low notes are played with the left hand as HA.
In example 423 the left hand plays the low bass notes and the right hand implies the chords.