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<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<sup><text font="italic">′</text></sup>)</tag>
<tag role="refnum">15a<sup><text font="italic">′</text></sup></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<sup><text font="italic">′′</text></sup>)</tag>
<tag role="refnum">15a<sup><text font="italic">′′</text></sup></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>