SectionE.1A Section in an Appendix

Inside a section.

SubsectionE.1.1A Subsection in a Section in an Appendix

Inside a subsection.

SubsubsectionE.1.1.1A Subsubsection in a Subsection in a Section in an Appendix

Nearly terminal.

Paragraphs in a Subsubsection in a Subsection in a Section in an Appendix.

The paragraphs element can go in any division, but does not get a number.