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GIAS phase 6 is "16 plus", and PHASE_GROUPS deliberately files it in the secondary group. The payload helper decided the same question with `"secondary" in phase_text`, which that value does not satisfy — so a sixth-form college was handed the primary bucket and offered infant schools as its peers, with the KS2 metric key to label them. No crash; just a page confidently showing the wrong schools. The decision now lives in similar_schools.is_secondary_phase, beside the PHASE_GROUPS bucket it selects from, so the two cannot drift again. A test pins them together. The same binary assumption had a second output. computeSchoolFlags tests for the substring too, so a 16-plus school renders the primary template, and the composer was labelling the section from the template: "Other primary schools near <sixth form college>" above a row of secondaries. The section now derives its noun from the school's own phase, which also removes the duplicated wording from both composers. A 16-plus school's candidates span the whole secondary group, so no single noun fits and it gets the honest general one. Reported in review on #150. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>