D-separation without tears by Judea Pearl (source code)

= D-separation without tears by Judea Pearl
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By <Judea Pearl>. Author-hosted supplement to Causality: https://bayes.cs.ucla.edu/BOOK-2K/d-sep.html

Sections1,1.2 and1.3 state the path criterion, blocking by conditioned noncolliders and activation by conditioning on a collider or its descendant.