Findings:

• stepwise progression
• progression by two
• Progression fantasy
• Whispers: Progression
• Skill Progression Tree
• The Artistic Progression of U2
• Panoptic Progression
• Progressions
• Flamenco progression
• Arithmetical
• digressive progression
• II-V-I progression
• Geometric Progression
• Overused chord progressions
• chord progression
• The Progression of Physical Pain
• Progression
• Kleene-Mostowski Arithmetical Hierarchy

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