pth-4 sf-no-children"><a href="../variables-xpressions/DEBUGGING-COMPLEX-HIERARCHIES-OF-XPRESSIONS.html" class="sf-depth-4">3.5 DEBUGGING COMPLEX HIERARCHIES OF EXPRESSIONS</a></li></ul></li><li id="menu-1393-1" class="middle even sf-item-6 sf-depth-3 sf-total-children-4 sf-parent-children-0 sf-single-children-4 menuparent"><a href="../Grids-Regions.html" class="sf-depth-3 menuparent">4. Grids &amp; Regions</a><ul><li id="menu-1253-1" class="first odd sf-item-1 sf-depth-4 sf-no-children"><a href="../Grids-R