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                      <XMTok font="italic" role="UNKNOWN">b</XMTok>
                      <XMTok fontsize="70%" meaning="12" role="NUMBER">12</XMTok>
                    </XMApp>
                  </XMApp>
                </XMath>
              </Math></td>
          </MathBranch>
        </MathFork>
      </equation>
      <equation xml:id="S0.E9">
        <tags>
          <tag>(9)</tag>
          <tag role="refnum">9</tag>
        </tags>
        <MathFork>
          <Math tex="\displaystyle a_{21}=b_{21}" text="a _ 21 = b _ 21" xml:id="S0.E9.m5">
            <XMath>
              <XMApp>
                <XMTok meaning="equals" role="RELOP">=</XMTok>
                <XMApp>
                  <XMTok role="SUBSCRIPTOP" scriptpos="post1"/>
                  <XMTok font="italic" role="UNKNOWN">a</XMTok>
                  <XMTok fontsize="70%" meaning="21" role="NUMBER">21</XMTok>
                </XMApp>
                <XMApp>
                  <XMTok role="SUBSCRIPTOP" scriptpos="post1"/>
                  <XMTok font="italic" role="UNKNOWN">b</XMTok>
                  <XMTok fontsize="70%" meaning="21" role="NUMBER">21</XMTok>
                </XMApp>
              </XMApp>
            </XMath>
          </Math>
          <MathBranch>
            <td align="right"><Math mode="inline" tex="\displaystyle a_{21}" text="a _ 21" xml:id="S0.E9.m1">
                <XMath>
                  <XMApp>
                    <XMTok role="SUBSCRIPTOP" scriptpos="post1"/>
                    <XMTok font="italic" role="UNKNOWN">a</XMTok>
                    <XMTok fontsize="70%" meaning="21" role="NUMBER">21</XMTok>
                  </XMApp>
                </XMath>
              </Math></td>
            <td align="left"><Math mode="inline" tex="\displaystyle=b_{21}" text="absent = b _ 21" xml:id="S0.E9.m2">
                <XMath>
                  <XMApp>
                    <XMTok meaning="equals" role="RELOP">=</XMTok>
                    <XMTok meaning="absent"/>
                    <XMApp>
                      <XMTok role="SUBSCRIPTOP" scriptpos="post1"/>
                      <XMTok font="italic" role="UNKNOWN">b</XMTok>
                      <XMTok fontsize="70%" meaning="21" role="NUMBER">21</XMTok>
                    </XMApp>
                  </XMApp>
                </XMath>
              </Math></td>
          </MathBranch>
        </MathFork>
        <MathFork>
          <Math tex="\displaystyle a_{22}=b_{22}+c_{22}" text="a _ 22 = b _ 22 + c _ 22" xml:id="S0.E9.m6">
            <XMath>
              <XMApp>
                <XMTok meaning="equals" role="RELOP">=</XMTok>
                <XMApp>
                  <XMTok role="SUBSCRIPTOP" scriptpos="post1"/>
                  <XMTok font="italic" role="UNKNOWN">a</XMTok>
                  <XMTok fontsize="70%" meaning="22" role="NUMBER">22</XMTok>
                </XMApp>
                <XMApp>
                  <XMTok meaning="plus" role="ADDOP">+</XMTok>
                  <XMApp>
                    <XMTok role="SUBSCRIPTOP" scriptpos="post1"/>
                    <XMTok font="italic" role="UNKNOWN">b</XMTok>
                    <XMTok fontsize="70%" meaning="22" role="NUMBER">22</XMTok>
                  </XMApp>
                  <XMApp>
                    <XMTok role="SUBSCRIPTOP" scriptpos="post1"/>
                    <XMTok font="italic" role="UNKNOWN">c</XMTok>
                    <XMTok fontsize="70%" meaning="22" role="NUMBER">22</XMTok>
                  </XMApp>
                </XMApp>
              </XMApp>
            </XMath>
          </Math>
          <MathBranch>
            <td align="right"><Math mode="inline" tex="\displaystyle a_{22}" text="a _ 22" xml:id="S0.E9.m3">
                <XMath>
                  <XMApp>
                    <XMTok role="SUBSCRIPTOP" scriptpos="post1"/>
                    <XMTok font="italic" role="UNKNOWN">a</XMTok>
                    <XMTok fontsize="70%" meaning="22" role="NUMBER">22</XMTok>
                  </XMApp>
                </XMath>
              </Math></td>
            <td align="left"><Math mode="inline" tex="\displaystyle=b_{22}+c_{22}" text="absent = b _ 22 + c _ 22" xml:id="S0.E9.m4">
                <XMath>
                  <XMApp>
                    <XMTok meaning="equals" role="RELOP">=</XMTok>
                    <XMTok meaning="absent"/>
                    <XMApp>
                      <XMTok meaning="plus" role="ADDOP">+</XMTok>
                      <XMApp>
                        <XMTok role="SUBSCRIPTOP" scriptpos="post1"/>
                        <XMTok font="italic" role="UNKNOWN">b</XMTok>
                        <XMTok fontsize="70%" meaning="22" role="NUMBER">22</XMTok>
                      </XMApp>
                      <XMApp>
                        <XMTok role="SUBSCRIPTOP" scriptpos="post1"/>
                        <XMTok font="italic" role="UNKNOWN">c</XMTok>
                        <XMTok fontsize="70%" meaning="22" role="NUMBER">22</XMTok>
                      </XMApp>
                    </XMApp>
                  </XMApp>
                </XMath>
              </Math></td>
          </MathBranch>
        </MathFork>
      </equation>
    </equationgroup>
    <equationgroup class="ltx_eqn_align" xml:id="S0.EGx4">
      <equation xml:id="S0.E11">
        <tags>
          <tag>(11)</tag>
          <tag role="refnum">11</tag>
        </tags>
        <MathFork>
          <Math tex="\displaystyle a_{11}=b_{11}" text="a _ 11 = b _ 11" xml:id="S0.E11.m5">
            <XMath>
              <XMApp>
                <XMTok meaning="equals" role="RELOP">=</XMTok>
                <XMApp>
                  <XMTok role="SUBSCRIPTOP" scriptpos="post1"/>
                  <XMTok font="italic" role="UNKNOWN">a</XMTok>
                  <XMTok fontsize="70%" meaning="11" role="NUMBER">11</XMTok>
                </XMApp>
                <XMApp>
                  <XMTok role="SUBSCRIPTOP" scriptpos="post1"/>
                  <XMTok font="italic" role="UNKNOWN">b</XMTok>
                  <XMTok fontsize="70%" meaning="11" role="NUMBER">11</XMTok>
                </XMApp>
              </XMApp>
            </XMath>
          </Math>
          <MathBranch>
            <td align="right"><Math mode="inline" tex="\displaystyle a_{11}" text="a _ 11" xml:id="S0.E11.m1">
                <XMath>
                  <XMApp>
                    <XMTok role="SUBSCRIPTOP" scriptpos="post1"/>
                    <XMTok font="italic" role="UNKNOWN">a</XMTok>
                    <XMTok fontsize="70%" meaning="11" role="NUMBER">11</XMTok>
                  </XMApp>
                </XMath>
              </Math></td>
            <td align="left"><Math mode="inline" tex="\displaystyle=b_{11}" text="absent = b _ 11" xml:id="S0.E11.m2">
                <XMath>
                  <XMApp>
                    <XMTok meaning="equals" role="RELOP">=</XMTok>
                    <XMTok meaning="absent"/>
                    <XMApp>
                      <XMTok role="SUBSCRIPTOP" scriptpos="post1"/>
                      <XMTok font="italic" role="UNKNOWN">b</XMTok>
                      <XMTok fontsize="70%" meaning="11" role="NUMBER">11</XMTok>
                    </XMApp>
                  </XMApp>
                </XMath>
              </Math></td>
          </MathBranch>
        </MathFork>
        <MathFork>
          <Math tex="\displaystyle a_{12}=b_{12}" text="a _ 12 = b _ 12" xml:id="S0.E11.m6">
            <XMath>
              <XMApp>
                <XMTok meaning="equals" role="RELOP">=</XMTok>
                <XMApp>
                  <XMTok role="SUBSCRIPTOP" scriptpos="post1"/>
                  <XMTok font="italic" role="UNKNOWN">a</XMTok>
                  <XMTok fontsize="70%" meaning="12" role="NUMBER">12</XMTok>
                </XMApp>
                <XMApp>
                  <XMTok role="SUBSCRIPTOP" scriptpos="post1"/>
                  <XMTok font="italic" role="UNKNOWN">b</XMTok>
                  <XMTok fontsize="70%" meaning="12" role="NUMBER">12</XMTok>
                </XMApp>
              </XMApp>
            </XMath>
          </Math>
          <MathBranch>
            <td align="right"><Math mode="inline" tex="\displaystyle a_{12}" text="a _ 12" xml:id="S0.E11.m3">
                <XMath>
                  <XMApp>
                    <XMTok role="SUBSCRIPTOP" scriptpos="post1"/>
                    <XMTok font="italic" role="UNKNOWN">a</XMTok>
                    <XMTok fontsize="70%" meaning="12" role="NUMBER">12</XMTok>
                  </XMApp>
                </XMath>
              </Math></td>
            <td align="left"><Math mode="inline" tex="\displaystyle=b_{12}" text="absent = b _ 12" xml:id="S0.E11.m4">
                <XMath>
                  <XMApp>
                    <XMTok meaning="equals" role="RELOP">=</XMTok>
                    <XMTok meaning="absent"/>
                    <XMApp>
                      <XMTok role="SUBSCRIPTOP" scriptpos="post1"/>
                      <XMTok font="italic" role="UNKNOWN">b</XMTok>
                      <XMTok fontsize="70%" meaning="12" role="NUMBER">12</XMTok>
                    </XMApp>
                  </XMApp>
                </XMath>
              </Math></td>
          </MathBranch>
        </MathFork>
      </equation>
      <equation xml:id="S0.E12">
        <tags>
          <tag>(12)</tag>
          <tag role="refnum">12</tag>
        </tags>
        <MathFork>
          <Math tex="\displaystyle a_{21}=b_{21}" text="a _ 21 = b _ 21" xml:id="S0.E12.m5">
            <XMath>
              <XMApp>
                <XMTok meaning="equals" role="RELOP">=</XMTok>
                <XMApp>
                  <XMTok role="SUBSCRIPTOP" scriptpos="post1"/>
                  <XMTok font="italic" role="UNKNOWN">a</XMTok>
                  <XMTok fontsize="70%" meaning="21" role="NUMBER">21</XMTok>
                </XMApp>
                <XMApp>
                  <XMTok role="SUBSCRIPTOP" scriptpos="post1"/>
                  <XMTok font="italic" role="UNKNOWN">b</XMTok>
                  <XMTok fontsize="70%" meaning="21" role="NUMBER">21</XMTok>
                </XMApp>
              </XMApp>
            </XMath>
          </Math>
          <MathBranch>
            <td align="right"><Math mode="inline" tex="\displaystyle a_{21}" text="a _ 21" xml:id="S0.E12.m1">
                <XMath>
                  <XMApp>
                    <XMTok role="SUBSCRIPTOP" scriptpos="post1"/>
                    <XMTok font="italic" role="UNKNOWN">a</XMTok>
                    <XMTok fontsize="70%" meaning="21" role="NUMBER">21</XMTok>
                  </XMApp>
                </XMath>
              </Math></td>
            <td align="left"><Math mode="inline" tex="\displaystyle=b_{21}" text="absent = b _ 21" xml:id="S0.E12.m2">
                <XMath>
                  <XMApp>
                    <XMTok meaning="equals" role="RELOP">=</XMTok>
                    <XMTok meaning="absent"/>
                    <XMApp>
                      <XMTok role="SUBSCRIPTOP" scriptpos="post1"/>
                      <XMTok font="italic" role="UNKNOWN">b</XMTok>
                      <XMTok fontsize="70%" meaning="21" role="NUMBER">21</XMTok>
                    </XMApp>
                  </XMApp>
                </XMath>
              </Math></td>
          </MathBranch>
        </MathFork>
        <MathFork>
          <Math tex="\displaystyle a_{22}=b_{22}+c_{22}" text="a _ 22 = b _ 22 + c _ 22" xml:id="S0.E12.m6">
            <XMath>
              <XMApp>
                <XMTok meaning="equals" role="RELOP">=</XMTok>
                <XMApp>
                  <XMTok role="SUBSCRIPTOP" scriptpos="post1"/>
                  <XMTok font="italic" role="UNKNOWN">a</XMTok>
                  <XMTok fontsize="70%" meaning="22" role="NUMBER">22</XMTok>
                </XMApp>
                <XMApp>
                  <XMTok meaning="plus" role="ADDOP">+</XMTok>
                  <XMApp>
                    <XMTok role="SUBSCRIPTOP" scriptpos="post1"/>
                    <XMTok font="italic" role="UNKNOWN">b</XMTok>
                    <XMTok fontsize="70%" meaning="22" role="NUMBER">22</XMTok>
                  </XMApp>
                  <XMApp>
                    <XMTok role="SUBSCRIPTOP" scriptpos="post1"/>
                    <XMTok font="italic" role="UNKNOWN">c</XMTok>
                    <XMTok fontsize="70%" meaning="22" role="NUMBER">22</XMTok>
                  </XMApp>
                </XMApp>
              </XMApp>
            </XMath>
          </Math>
          <MathBranch>
            <td align="right"><Math mode="inline" tex="\displaystyle a_{22}" text="a _ 22" xml:id="S0.E12.m3">
                <XMath>
                  <XMApp>
                    <XMTok role="SUBSCRIPTOP" scriptpos="post1"/>
                    <XMTok font="italic" role="UNKNOWN">a</XMTok>
                    <XMTok fontsize="70%" meaning="22" role="NUMBER">22</XMTok>
                  </XMApp>
                </XMath>
              </Math></td>
            <td align="left"><Math mode="inline" tex="\displaystyle=b_{22}+c_{22}" text="absent = b _ 22 + c _ 22" xml:id="S0.E12.m4">
                <XMath>
                  <XMApp>
                    <XMTok meaning="equals" role="RELOP">=</XMTok>
                    <XMTok meaning="absent"/>
                    <XMApp>
                      <XMTok meaning="plus" role="ADDOP">+</XMTok>
                      <XMApp>
                        <XMTok role="SUBSCRIPTOP" scriptpos="post1"/>
                        <XMTok font="italic" role="UNKNOWN">b</XMTok>
                        <XMTok fontsize="70%" meaning="22" role="NUMBER">22</XMTok>
                      </XMApp>
                      <XMApp>
                        <XMTok role="SUBSCRIPTOP" scriptpos="post1"/>
                        <XMTok font="italic" role="UNKNOWN">c</XMTok>
                        <XMTok fontsize="70%" meaning="22" role="NUMBER">22</XMTok>
                      </XMApp>
                    </XMApp>
                  </XMApp>
                </XMath>
              </Math></td>
          </MathBranch>
        </MathFork>
      </equation>
    </equationgroup>
  </para>
  <para xml:id="p2">
    <p>Sub-numbered equations</p>
    <equationgroup xml:id="S0.E14">
      <tags>
        <tag>(14)</tag>
        <tag role="refnum">14</tag>
      </tags>
      <equation xml:id="S0.E14.1">
        <tags>
          <tag>(14a)</tag>
          <tag role="refnum">14a</tag>
        </tags>
        <Math mode="display" tex="N=14a" text="N = 14 * a" xml:id="S0.E14.1.m1">
          <XMath>
            <XMApp>
              <XMTok meaning="equals" role="RELOP">=</XMTok>
              <XMTok font="italic" role="UNKNOWN">N</XMTok>
              <XMApp>
                <XMTok meaning="times" role="MULOP">⁢</XMTok>
                <XMTok meaning="14" role="NUMBER">14</XMTok>
                <XMTok font="italic" role="UNKNOWN">a</XMTok>
              </XMApp>
            </XMApp>
          </XMath>
        </Math>
      </equation>
      <equation xml:id="S0.E14.2">
        <tags>
          <tag>(14b)</tag>
          <tag role="refnum">14b</tag>
        </tags>
        <Math mode="display" tex="N=14b" text="N = 14 * b" xml:id="S0.E14.2.m1">
          <XMath>
            <XMApp>
              <XMTok meaning="equals" role="RELOP">=</XMTok>
              <XMTok font="italic" role="UNKNOWN">N</XMTok>
              <XMApp>
                <XMTok meaning="times" role="MULOP">⁢</XMTok>
                <XMTok meaning="14" role="NUMBER">14</XMTok>
                <XMTok font="italic" role="UNKNOWN">b</XMTok>
              </XMApp>
            </XMApp>
          </XMath>
        </Math>
      </equation>
    </equationgroup>
  </para>
  <para xml:id="p3">
    <p>Subnumbered, but some unnumbered (before/after) or tagged explicitly (before/after)</p>
    <equationgroup xml:id="S0.E15">
      <tags>
        <tag>(15)</tag>
        <tag role="refnum">15</tag>
      </tags>
      <equation xml:id="S0.E15.1">
        <tags>
          <tag>(15a)</tag>
          <tag role="refnum">15a</tag>
        </tags>
        <Math mode="display" tex="N=15a" text="N = 15 * a" xml:id="S0.E15.1.m1">
          <XMath>
            <XMApp>
              <XMTok meaning="equals" role="RELOP">=</XMTok>
              <XMTok font="italic" role="UNKNOWN">N</XMTok>
              <XMApp>
                <XMTok meaning="times" role="MULOP">⁢</XMTok>
                <XMTok meaning="15" role="NUMBER">15</XMTok>
                <XMTok font="italic" role="UNKNOWN">a</XMTok>
              </XMApp>
            </XMApp>
          </XMath>
        </Math>
      </equation>
      <equation xml:id="S0.E15.x1">
        <Math mode="display" tex="N=15a" text="N = 15 * a" xml:id="S0.E15.x1.m1">
          <XMath>
            <XMApp>
              <XMTok meaning="equals" role="RELOP">=</XMTok>
              <XMTok font="italic" role="UNKNOWN">N</XMTok>
              <XMApp>
                <XMTok meaning="times" role="MULOP">⁢</XMTok>
                <XMTok meaning="15" role="NUMBER">15</XMTok>
                <XMTok font="italic" role="UNKNOWN">a</XMTok>
              </XMApp>
            </XMApp>
          </XMath>
        </Math>
      </equation>
      <equation xml:id="S0.E15.x2">
        <Math mode="display" tex="N=15b" text="N = 15 * b" xml:id="S0.E15.x2.m1">
          <XMath>
            <XMApp>
              <XMTok meaning="equals" role="RELOP">=</XMTok>
              <XMTok font="italic" role="UNKNOWN">N</XMTok>
              <XMApp>
                <XMTok meaning="times" role="MULOP">⁢</XMTok>
                <XMTok meaning="15" role="NUMBER">15</XMTok>
                <XMTok font="italic" role="UNKNOWN">b</XMTok>
              </XMApp>
            </XMApp>
          </XMath>
        </Math>
      </equation>
      <equation xml:id="S0.E15.x3">
        <tags>
          <tag>(15a<Math mode="inline" tex="{}^{\prime}" text="^prime" xml:id="S0.E15.x3.m1">
              <XMath>
                <XMApp role="FLOATSUPERSCRIPT" scriptpos="1">
                  <XMTok fontsize="70%" name="prime" role="SUPOP">′</XMTok>
                </XMApp>
              </XMath>
            </Math>)</tag>
          <tag role="refnum">15a<Math mode="inline" tex="{}^{\prime}" text="^prime" xml:id="S0.E15.x3.m2">
              <XMath>
                <XMApp role="FLOATSUPERSCRIPT" scriptpos="1">
                  <XMTok fontsize="70%" name="prime" role="SUPOP">′</XMTok>
                </XMApp>
              </XMath>
            </Math></tag>
        </tags>
        <Math mode="display" tex="N=15a" text="N = 15 * a" xml:id="S0.E15.x3.m3">
          <XMath>
            <XMApp>
              <XMTok meaning="equals" role="RELOP">=</XMTok>
              <XMTok font="italic" role="UNKNOWN">N</XMTok>
              <XMApp>
                <XMTok meaning="times" role="MULOP">⁢</XMTok>
                <XMTok meaning="15" role="NUMBER">15</XMTok>
                <XMTok font="italic" role="UNKNOWN">a</XMTok>
              </XMApp>
            </XMApp>
          </XMath>
        </Math>
      </equation>
      <equation xml:id="S0.E15.x4">
        <tags>
          <tag>(15a<Math mode="inline" tex="{}^{\prime\prime}" text="^prime2" xml:id="S0.E15.x4.m1">
              <XMath>
                <XMApp role="FLOATSUPERSCRIPT" scriptpos="1">
                  <XMTok fontsize="70%" name="prime2" role="SUPOP">′′</XMTok>
                </XMApp>
              </XMath>
            </Math>)</tag>
          <tag role="refnum">15a<Math mode="inline" tex="{}^{\prime\prime}" text="^prime2" xml:id="S0.E15.x4.m2">
              <XMath>
                <XMApp role="FLOATSUPERSCRIPT" scriptpos="1">
                  <XMTok fontsize="70%" name="prime2" role="SUPOP">′′</XMTok>
                </XMApp>
              </XMath>
            </Math></tag>
        </tags>
        <Math mode="display" tex="N=15b" text="N = 15 * b" xml:id="S0.E15.x4.m3">
          <XMath>
            <XMApp>
              <XMTok meaning="equals" role="RELOP">=</XMTok>
              <XMTok font="italic" role="UNKNOWN">N</XMTok>
              <XMApp>
                <XMTok meaning="times" role="MULOP">⁢</XMTok>
                <XMTok meaning="15" role="NUMBER">15</XMTok>
                <XMTok font="italic" role="UNKNOWN">b</XMTok>
              </XMApp>
            </XMApp>
          </XMath>
        </Math>
      </equation>
      <equation xml:id="S0.E15.2">
        <tags>
          <tag>(15b)</tag>
          <tag role="refnum">15b</tag>
        </tags>
        <Math mode="display" tex="N=15b" text="N = 15 * b" xml:id="S0.E15.2.m1">
          <XMath>
            <XMApp>
              <XMTok meaning="equals" role="RELOP">=</XMTok>
              <XMTok font="italic" role="UNKNOWN">N</XMTok>
              <XMApp>
                <XMTok meaning="times" role="MULOP">⁢</XMTok>
                <XMTok meaning="15" role="NUMBER">15</XMTok>
                <XMTok font="italic" role="UNKNOWN">b</XMTok>
              </XMApp>
            </XMApp>
          </XMath>
        </Math>
      </equation>
    </equationgroup>
  </para>
</document>
