File: mycells.v

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module NOT(A, Y);
input A;
output Y = ~A;
endmodule

module NAND(A, B, Y);
input A, B;
output Y = ~(A & B);
endmodule

module NOR(A, B, Y);
input A, B;
output Y = ~(A | B);
endmodule

module DFF(C, D, Q);
input C, D;
output reg Q;
always @(posedge C)
	Q <= D;
endmodule