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Pernambuco grain, squared tips and pencil length marks make them recognizable fabrication pieces. A plane, resin block and violin case sit beyond the candidates while the horizontal staves are selected for the next machining pass. The candidate centerlines keep the source endpoints and angles in a perpendicular view. Surrounding detail stays outside the work region, and the answer circles enclose every horizontal item without touching slanted distractors.","domain_shift":"Instrument making makes orientation inspection purposeful; real wood components and tools replace bare line strokes without changing the line-based predicate or reference frame.","mechanism":"Build thin straight objects around the source line segments, using small physical thickness. Keep the camera fixed and apply answer circles to the original horizontal candidate set.","fidelity_note":"The predicate is image-horizontal orientation of candidate centerlines. 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