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Module mux_4_1 selects one of i_d0, i_d1, i_d2, i_d3 based on i_sel(1:0) and outputs it on o_y. The required structure: three mux_2_1 wired as a tree.
mux_4_1
i_d0
i_d1
i_d2
i_d3
i_sel(1:0)
o_y
mux_2_1