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<?php
//* Do NOT include the opening php tag shown above. Copy the code shown below.

//* Modify the Leave a Reply title above comment form
add_filter( 'comment_form_defaults', 'sk_comment_form_defaults' );
function sk_comment_form_defaults( $defaults ) {
 
    $defaults['title_reply'] = __( 'Leave a Comment' );
    return $defaults;
 
}