wordpress add_post_meta more than one key value store

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add_action('save_post',function($pid){

   add_post_meta($pid,'country','India');

});

on saving post it is creating 3 meta keys/value with country – India,,
i want ti to right now one so that later can add multiple entry for this key,,

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  1. Create a Array:

    add_action('save_post',function($pid){


   $country = array('country_1' => 'India', 'country_2' => 'Cuba', 'country_3' => 'Irlanda'); //Or you can get "get_options('country')" dynamic.

   //Or this:
   //$country = array('India', 'Cuba', 'Irlanda');

   add_post_meta($pid,'country', $country);

});

    I hope help you.