// test_simulation_nand_1_test.v
module f1_test(input [1:0] in, output out);
assign out = ~(in[0] & in[1]);
endmodule

// test_simulation_nand_3_test.v
module f2_test(input [2:0] in, output out);
assign out = !(in[0] & in[1] & in[2]);
endmodule

// test_simulation_nand_4_test.v
module f3_test(input [2:0] in, output out);
assign out = ~(in[0] && in[1] && in[2]);
endmodule

// test_simulation_nand_5_test.v
module f4_test(input [3:0] in, output out);
assign out = !(in[0] & in[1] & in[2] & in[3]);
endmodule

// test_simulation_nand_6_test.v
module f5_test(input [3:0] in, output out);
assign out = !(in[0] && in[1] && in[2] && in[3]);
endmodule