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Verilog is a rich language for modeling at low levels of abstraction. It has built-in primitives like
n-input nand gates and buffers. VHDL, on the other hand, is more suited for modeling at higher levels.
Though it is possible to create entities corresponding to Verilog gates, Verilog2VHDL translates
a gate instantiation for almost all gates into equivalent VHDL concurrent signal assignments.