The first measure of the second phrase is like the first measure of the previous phrase transported to Bb minor. From measure 6, Chopin uses more chromatism than in the first phrase, but we find a harmonic plan that brings us back to Eb minor. Notice how the harmonic progression of measures 7 and 8 repeats one tone below in measures 9 and 10:
A detailed analysis of measures 5 and 6:
Measures 7 to 9:
Measures 10 to 11:
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