Notes
Improper subset is a subset that includes the entire parent set.
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SubscribeImproper subset is a subset that includes the entire parent set.
Tags: Improper subset
Subjects: Math
Exams:
Fatal error: Uncaught TypeError: array_keys(): Argument #1 ($array) must be of type array, null given in /var/www/html/ed/wp-content/themes/edukate/single.php:243
Stack trace:
#0 /var/www/html/ed/wp-content/themes/edukate/single.php(243): array_keys()
#1 /var/www/html/ed/wp-includes/template-loader.php(106): include('...')
#2 /var/www/html/ed/wp-blog-header.php(19): require_once('...')
#3 /var/www/html/ed/index.php(17): require('...')
#4 {main}
thrown in /var/www/html/ed/wp-content/themes/edukate/single.php on line 243