it is important to read this Codex chapter all the way to the end, as the essential suggestions are after this heading ‘Note for Multiple Posts in the First Category’;
repetitive, tedious code:
<?php $do_not_duplicate = array(); ?>
<?php $mosaics = new WP_Query('category_name=mosaics&posts_per_page=5'); ?>
<?php while ($mosaics->have_posts()) : $mosaics->the_post(); ?>
<?php $do_not_duplicate[] = $post->ID; ?>
<?php echo get_the_content(); ?>
<?php endwhile; wp_reset_postdata(); ?>
<br />
<?php $mosaics = new WP_Query( array( 'category_name' => 'mosaics', 'posts_per_page' => 4, 'post__not_in' => $do_not_duplicate ) ); ?>
<?php while ($mosaics->have_posts()) : $mosaics->the_post(); ?>
<?php $do_not_duplicate[] = $post->ID; ?>
<?php echo get_the_content(); ?>
<?php endwhile; wp_reset_postdata(); ?>
<br />
<?php $mosaics = new WP_Query( array( 'category_name' => 'mosaics', 'posts_per_page' => 3, 'post__not_in' => $do_not_duplicate ) ); ?>
<?php while ($mosaics->have_posts()) : $mosaics->the_post(); ?>
<?php $do_not_duplicate[] = $post->ID; ?>
<?php echo get_the_content(); ?>
<?php endwhile; wp_reset_postdata(); ?>
<br />
<?php $mosaics = new WP_Query( array( 'category_name' => 'mosaics', 'posts_per_page' => 2, 'post__not_in' => $do_not_duplicate ) ); ?>
<?php while ($mosaics->have_posts()) : $mosaics->the_post(); ?>
<?php $do_not_duplicate[] = $post->ID; ?>
<?php echo get_the_content(); ?>
<?php endwhile; wp_reset_postdata(); ?>