Every verse in the reader opens with a single line saying what step the song has just taken. Lift those lines out, set them end to end, and the whole argument is there — no verses, no commentary, nothing but the reasoning walking forward.
Read one book, or read all eighteen as a single scroll. Each line carries its verse — follow it in to the full reading.
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A song is not a list of sayings. Every verse is a step taken because of the step before it — and read this way, the whole of it moves.