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            <h2><font color="#ffffff">Search Algorithms: R2</font></h2>
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<p>The R2 ("Rule 2") algorithm is one of a set of pairwise orientation
    algorithms included. To use it, first somehow
    construct a graph with known adjacencies, by search or by loading a graph from
    a file, and then make an Algorithm box that is a child of the graph in the
    workbench. Then select R2 as the pairwise algorithm to be used. The adjacencies
    in the input graph will oriented by appeal to non-Gaussianity.
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<h3>References: </h3>
<p>Spirtes, Glymour, and Scheines (2000). Causation, Prediction, and Search.</p>
<p>Chris Meek (1995), &quot;Causal inference and causal explanation with background knowledge.&quot;</p>
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