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Here's the D flat Major scale in P1. It's the C scale form moved up one fret. This scale has 2 tones on string 3. D flat is the "opposite" of D Major. D Major has 2 sharps (F♯, C♯). In D flat, only F and C are naturals. In D flat, all of the flats (B♭, E♭, A♭, D♭, G♭) are naturals in the key of D Major. Play the scale, academically, as shown in the tab. This scale can be played in this manner, in every position.
Now, we mix. If we were to play these notes in order from Middle E to High G, we are stepping up the scale. When they are all naturals, we are in the scale of C Major [the 'upper half']. Stepping is playing the next available line or space up or down from the note we are playing.