Often we have to play on the off beats, without the help of a downbeat in our rhythms. Usually we can either place the beats too late or too soon. This hopefully will help in how we can feel where the proper placement of each note should be.
The last variation posted is a combination of both Variation 2 and Variation 3. In the rhythm, 1 and uh 2 and uh 3 and uh 4 and uh, go upwards in the chromatic scale while striking the note a half step below the primary note.
With the third variation, as you go upwards chromatically you will be striking a note a half step below the main pitches every 2nd triplet (C, B, C; C#, C, C#; etc.). This is done in 16th triplets upwards and a major scale down in 16ths.