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(a) Vertucci's canal classification type I (1), (b) Vertucci's canal classification type II (2-1), (c) Vertucci's canal classification type III (1-2-1), (d) Vertucci's canal classification type IV (2), (e) Vertucci's canal classification type V (1-2), (f) Vertucci's canal classification type VI (2-1-2), (g) Vertucci's canal classification type VII (1-2-1-2), and (h) Vertucci's canal classification type VIII (3)
