ng_binary_search_tree">self-balancing
    binary trees</a>, but now we decided that it's time to move on to something
more in the spirit of 2010s. Since SQL databases have already become passé,
we decided to skip directly to the
<a href="http://en.wikipedia.org/wiki/NoSQL">NoSQL</a> trend of databases
(also known as "Oh no! No SQL!") and to write alternative backends for
Freecell Solver™ for distributed NoSQL stores such as
<a href="http://en.wikipedia.org/wiki/Cassandra_%28database%29">Cassandra</a>,
<a