[MySQL cheat sheet](http://www.nparikh.org/unix/mysql.php)
: Basic syntax for common commands.
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[Japanese manhole covers](http://www.japanvisitor.com/index.php?cID=359)
: Japanese manhole covers, which come in a variety of designs depending on locality, utility type and the manufacturer of the manhole cover, have caught the imagination of a growing number of drainspotters from around the world.
: Stock photography community providing high quality stock photos and stock images. Free photos added weekly.