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my $response = $browser->post($url, [ 'Encounter1847760942' => "$enc_id", ... 'DaysBack1847760942' => "3", 'ProcedureSearchText1847760942' => "", 'EncounterOptionSelected' => "false" ], @ns_headers);
$response = $browser->content($poststring); # where $poststring = 'checkbox'=>\"1\"" etc....