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📜 WAYPOINT LESSON

Checkpoint: the playlist

⭐ beginner⏳ 25 min read📍 Lesson 80 of 256

The full readiness loop: state, first-occurrence search, refusal contract.

The pattern: the playlist is every skill at once — an ArrayList field, a mutator, an indexOf-based first-occurrence remover with a boolean contract, and a derived size. The refusal path must touch NOTHING. If you traced the state table before coding, you were ready before you wrote a line — which is the entire point of this course.