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inline QModelIndex index(int row, int column, const QModelIndex &/*parent*/ = QModelIndex()) const { return createIndex(row, column); }
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inline QModelIndex parent(const QModelIndex &) const { return QModelIndex(); }
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inline int columnCount(const QModelIndex &/*parent*/ = QModelIndex()) const { return 3; }
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virtual QVariant data(const QModelIndex &index, int role) const;