Test Inheritance and Super calls:
<?php $this->start("b1"); ?>(1 1)<?php $this->end("b1"); ?>
<?php $this->start("b2"); ?>(1 2)<?php $this->end("b2"); ?>
<?php $this->start("b3") ?>(1 3)<?php $this->end("b3"); ?>
<?php $this->start("b4") ?><?php $this->end("b4"); ?>
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