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GESSO : duo[i % 2];\n body += wash(rng, x0, x0 + i * bh, x1 - x0, bh, c, `w${i}`);\n }\n for (let i = 0; i <= n; i++) {\n body += line(rng, x0 + i * bh, x0, x1, true);\n }\n } else if (mode === \"stripes\") {\n // Broad pastel bands with white bands between; graphite nearly absent\n const m = 14 + rng() * 16;\n const x0 = m, x1 = S - m;\n const pairs = 3 + Math.floor(rng() * 4);\n const unit = (x1 - x0) / pairs;\n const whiteFrac = 0.25 + rng() * 0.25;\n for (let i = 0; i < pairs; i++) {\n const y = x0 + i * unit;\n body += wash(rng, x0, y, x1 - x0, unit * (1 - whiteFrac), duo[i % 2], `w${i}`);\n body += wash(rng, x0, y + unit * (1 - whiteFrac), x1 - x0, unit * whiteFrac, GESSO, `v${i}`);\n if (rng() < 0.4) body += line(rng, y, x0, x1, true, 0.4);\n }\n } else {\n // white: dense horizontal graphite on gesso\n const m = 30 + rng() * 40;\n const x0 = m, x1 = S - m;\n body += wash(rng, x0, x0, x1 - x0, x1 - x0, GESSO, \"w0\");\n const gap = 8 + rng() * 12;\n for (let y = x0; y <= x1; y 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Diff · v1