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Misconception diagnosis for arithmetic practice. A wrong answer to a whole-number or fraction-addition prompt walks a fixed tree of yes-or-no questions and gets a cause, such as misrecruited.no_carry or slip.one_digit. tutor misconceptions and learn_tutor_misconceptions now count causes per objective in a diagnoses field. The diagnosis never shows the correct answer. On 50 held-out teacher-labelled answers it agreed with the teacher on 96%; details in docs/MISCONCEPTION-DIAGNOSIS.md.