A single-phase three-winding transformer has the following parameters: Z1 = Z2 = Z3 = 0 + j0.05, Gc = 0, and Bm = 0.2 per unit. Three identical transformers, as described, are connected with their primaries in Y (solidly grounded neutral) and with their secondaries and tertiaries in Δ. Draw the per-unit sequence networks of this transformer bank.