diff --git a/a.php b/a.php
new file mode 100644
index 0000000..e8fedaa
--- /dev/null
+++ b/a.php
@@ -0,0 +1,20 @@
+<?php
+
+$files = glob("*/*.crt");
+$ids = [];
+
+foreach($files as $file) {
+	$text = shell_exec("openssl x509 -in $file -noout -text | head -n 4 | tail -n 1");
+	preg_match('!: (\d+)!', $text, $match);
+	$serialNumber = $match[1];
+	list($name, ) = explode('/', $file);
+
+	#echo "$name $serialNumber\n";
+
+	if (isset($ids[$serialNumber])) {
+		echo "DUPLICATE: $serialNumber {$ids[$serialNumber]} $name\n";
+	} else {
+		$ids[$serialNumber] = $name;
+	}
+
+}
\ No newline at end of file
diff --git a/mindmap_app/mindmap_app.crt b/mindmap_app/mindmap_app.crt
index 40225fb..950478b 100644
--- a/mindmap_app/mindmap_app.crt
+++ b/mindmap_app/mindmap_app.crt
@@ -1,8 +1,8 @@
 -----BEGIN CERTIFICATE-----
-MIIEBjCCAu4CAhD9MA0GCSqGSIb3DQEBCwUAMHsxCzAJBgNVBAYTAkRFMRswGQYD
+MIIEBjCCAu4CAhEQMA0GCSqGSIb3DQEBCwUAMHsxCzAJBgNVBAYTAkRFMRswGQYD
 VQQIDBJCYWRlbi1XdWVydHRlbWJlcmcxFzAVBgNVBAoMDk5leHRjbG91ZCBHbWJI
 MTYwNAYDVQQDDC1OZXh0Y2xvdWQgQ29kZSBTaWduaW5nIEludGVybWVkaWF0ZSBB
-dXRob3JpdHkwHhcNMTkxMDAyMTA1NDQ2WhcNMzAwMTA3MTA1NDQ2WjAWMRQwEgYD
+dXRob3JpdHkwHhcNMjAwNDI3MTIyMDM0WhcNMzAwODAzMTIyMDM0WjAWMRQwEgYD
 VQQDDAttaW5kbWFwX2FwcDCCAiIwDQYJKoZIhvcNAQEBBQADggIPADCCAgoCggIB
 ALnu86E2M5IKeQ8GNPrOuNDGHbE4vZg+P7zlsy613NC++IYC4FjzbaDLCWWMXahV
 AM4nvCegbrXhgjS0a7hP8LmZ9I4sapNwpz/3NPgz65GDvB8cehCfA0eoZ31z5amZ
@@ -15,10 +15,10 @@ kLclblaHz8qTaOB7PqVh8H1VGBmBMdNSPxAGKacLuOldONYr3Wlvz7eJzvs845qE
 Skyf6Bfqfr2X2At4idP7fKbhpH48ORkasJj1L1mq/zP2FNf22/korgRTcjTarzHh
 ZJ+g4TnKXy1b8SDCP+/jOkQGuT2ls8SNPoyj4TkAn4U+rdzU2rXWhZwkrt5h3c/k
 /IpX1/Z09f3RK4F1IHtsH4va0kRvefzlZgw/B9nWpsEtAgMBAAEwDQYJKoZIhvcN
-AQELBQADggEBADcmJhp1xQ2NkJhLbc5Fwsy3LNx68kRgOaoNAspAv1rQLEWMxtF7
-gJVYwukZ6HkL0E7hPxR0l97C6Z14OOt5VSFv8eBNjNIJHGxzlWhSsPSB2BJOlPae
-8Ai3ZihPNjTTsNJYj8aa0WQbyZOdir8bEoyCuMQG5WpBwGCpDaaAZBojdDYpgBoB
-e5hmJI9A1QiCrJ4xbvG2OOcSTaoEO25D3P6keQechq7+6rhyj06f0SQj1KHLDgM4
-r7vEV6L0rzbzJSMTPZIfmeU46wmzJkng7cFdHAz8UOrG5hJxSXKAvh8EkRSO7BfR
-hgGJiyeRVciDcx35nVrPHe+i3FQIuswbIb4=
+AQELBQADggEBAGZP1Ht8RpjqSVjjz744ES/QPvwBoy2cbcSTjSCIvWkJH1pB7FNc
+syyM1e/SPmqcpJZhkBqF/lS6g3QFtAM9m0pNuIfTfuayln/XBdfYI51RtEZ9UbqR
+IIexn61ayWgRwL6ws5ePbXWEELwsRp9NwIjmo/2S9FU4+alHXVx9QQvc5DVQAS8x
+HU+13NSH4prZGlC5YvtdbXybzEqWAVxjp+3+uFUqhOfkqEJQb2TzUmtABjDjCvuZ
+1VCGk1BcSki4tdDZ96JT2xmyYLbVMPqwLBziG5V7AV04f+xrq/xXRx8hb1aRafAP
+ySMEae5wreain0Ct187yV1HPaApT7veVJnA=
 -----END CERTIFICATE-----