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

<!-- To change h4 to h3: -->

<!-- Above -->

//* Start the engine

<!-- add -->

add_filter( 'genesis_register_sidebar_defaults', 'ozzy_register_sidebar_defaults' );

<!-- then near the end, -->

function ozzy_register_sidebar_defaults( $defaults ) {
    $defaults['before_title'] = '<h3 class="widget-title widgettitle">';
    $defaults['after_title'] = '</h3>';
    return $defaults;
}