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module and_1 (y,a,b);
 input a, b;
...

  
endmodule

module or_1 (y,a,b);
 input a, b;
...

 
endmodule

module and_1 (y,a,b);
 input a, b;
...
 
endmodule

module and_1 (y,a,b); //not changing anything
 input a, b;
...

 
endmodule