MazeGrowth.xml

<one values="BWA" in="WBB" out="WAW" origin="Center"/>

<!--
Compare to an implementation in a conventional language: https://bl.ocks.org/mbostock/70a28267db0354261476

Note that MJ interpreter automatically performs optimizations. It doesn't forget past matches, so it searches only over a small part of the grid each turn.
-->

<!--<sequence values="BWA" origin="Center">
  <one in="WBB" out="WAW"/>
  <all in="A" out="W"/>
</sequence>-->