Different route with different parameters to same method in laravel

I have 2 routes one for get and one for post method. For get route, i have 2 extra parameters in route, so when post method is called it says error some parameter is missing

Routes.php file,

Route::get('/abc/{one}/{two}','MainController@someFunction');
Route::post('/abc','MainController@someFunction');

Controller file,

someFunction(Request $req, $first,$second){

problem is here when i use post method as there are no parameters 
and this function is expecting $first and $second parameters

}

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