As shown in the following example, a simple two-note repetition is gradually made into a longer phrase.

Further expand the range up and down.

 Like this, develop from something simple to something more complex.

 Here, only the first part (no pistons pressed, 1st position for trombone) is written, but please practice each pattern 6 steps lower.
 It is difficult to reach the 7th position on a trombone, so if you end up in an awkward position or the pitch becomes too high, it is better to stop at the 6th position (or 5th position).