This is incorrect formatting of a PHP array:
'cat' => '4', '5', '6', '7'
Use category__in and pass an array of category IDs:
$args = array(
'posts_per_page' => 4,
'category__in' => array( 4, 5, 6, 7 )
);
See WP_Query for all valid parameters and how to format them correctly.
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