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    <tags>
      <tag>1</tag>
      <tag role="refnum">1</tag>
      <tag role="typerefnum">§1</tag>
    </tags>
    <title><tag close=" ">1</tag>Testing Choose</title>
    <para xml:id="S1.p1">
      <p>beep hello, BEEP. beep.</p>
    </para>
    <para xml:id="S1.p2">
      <p>1. <Math mode="inline" tex="a+b" text="a + b" xml:id="S1.p2.m1">
          <XMath>
            <XMApp>
              <XMTok meaning="plus" role="ADDOP">+</XMTok>
              <XMTok font="italic" role="UNKNOWN">a</XMTok>
              <XMTok font="italic" role="UNKNOWN">b</XMTok>
            </XMApp>
          </XMath>
        </Math></p>
    </para>
    <para xml:id="S1.p3">
      <p>2. <Math mode="inline" tex="a\choose b" text="a binomial b" xml:id="S1.p3.m1">
          <XMath>
            <XMDual>
              <XMApp>
                <XMRef idref="S1.p3.m1.1"/>
                <XMRef idref="S1.p3.m1.2"/>
                <XMRef idref="S1.p3.m1.3"/>
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              <XMWrap>
                <XMTok role="OPEN" stretchy="true">(</XMTok>
                <XMApp xml:id="S1.p3.m1.4">
                  <XMTok mathstyle="text" meaning="binomial" role="FRACOP" thickness="0pt" xml:id="S1.p3.m1.1"/>
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                </XMApp>
                <XMTok role="CLOSE" stretchy="true">)</XMTok>
              </XMWrap>
            </XMDual>
          </XMath>
        </Math></p>
    </para>
    <para xml:id="S1.p4">
      <p>3. <Math mode="inline" tex="a+{b\choose c}+d" text="a + b binomial c + d" xml:id="S1.p4.m1">
          <XMath>
            <XMApp>
              <XMTok meaning="plus" role="ADDOP">+</XMTok>
              <XMTok font="italic" role="UNKNOWN">a</XMTok>
              <XMDual>
                <XMApp>
                  <XMRef idref="S1.p4.m1.1"/>
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                    <XMTok font="italic" fontsize="70%" role="UNKNOWN" xml:id="S1.p4.m1.2">b</XMTok>
                    <XMTok font="italic" fontsize="70%" role="UNKNOWN" xml:id="S1.p4.m1.3">c</XMTok>
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                  <XMTok role="CLOSE" stretchy="true">)</XMTok>
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              <XMTok font="italic" role="UNKNOWN">d</XMTok>
            </XMApp>
          </XMath>
        </Math></p>
    </para>
    <para xml:id="S1.p5">
      <p>4. <Math mode="inline" tex="a+{b\choose c}+d" text="a + b binomial c + d" xml:id="S1.p5.m1">
          <XMath>
            <XMApp>
              <XMTok meaning="plus" role="ADDOP">+</XMTok>
              <XMTok font="italic" role="UNKNOWN">a</XMTok>
              <XMDual>
                <XMApp>
                  <XMRef idref="S1.p5.m1.1"/>
                  <XMRef idref="S1.p5.m1.2"/>
                  <XMRef idref="S1.p5.m1.3"/>
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                <XMWrap>
                  <XMTok role="OPEN" stretchy="true">(</XMTok>
                  <XMApp xml:id="S1.p5.m1.4">
                    <XMTok mathstyle="text" meaning="binomial" role="FRACOP" thickness="0pt" xml:id="S1.p5.m1.1"/>
                    <XMTok font="italic" fontsize="70%" role="UNKNOWN" xml:id="S1.p5.m1.2">b</XMTok>
                    <XMTok font="italic" fontsize="70%" role="UNKNOWN" xml:id="S1.p5.m1.3">c</XMTok>
                  </XMApp>
                  <XMTok role="CLOSE" stretchy="true">)</XMTok>
                </XMWrap>
              </XMDual>
              <XMTok font="italic" role="UNKNOWN">d</XMTok>
            </XMApp>
          </XMath>
        </Math></p>
    </para>
    <para xml:id="S1.p6">
      <p>5. <Math mode="inline" tex="a+{b\choose c}+d" text="a + b binomial c + d" xml:id="S1.p6.m1">
          <XMath>
            <XMApp>
              <XMTok meaning="plus" role="ADDOP">+</XMTok>
              <XMTok font="italic" role="UNKNOWN">a</XMTok>
              <XMDual>
                <XMApp>
                  <XMRef idref="S1.p6.m1.1"/>
                  <XMRef idref="S1.p6.m1.2"/>
                  <XMRef idref="S1.p6.m1.3"/>
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                <XMWrap>
                  <XMTok role="OPEN" stretchy="true">(</XMTok>
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                    <XMTok mathstyle="text" meaning="binomial" role="FRACOP" thickness="0pt" xml:id="S1.p6.m1.1"/>
                    <XMTok font="italic" fontsize="70%" role="UNKNOWN" xml:id="S1.p6.m1.2">b</XMTok>
                    <XMTok font="italic" fontsize="70%" role="UNKNOWN" xml:id="S1.p6.m1.3">c</XMTok>
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                  <XMTok role="CLOSE" stretchy="true">)</XMTok>
                </XMWrap>
              </XMDual>
              <XMTok font="italic" role="UNKNOWN">d</XMTok>
            </XMApp>
          </XMath>
        </Math></p>
    </para>
    <para xml:id="S1.p7">
      <p>6. <Math mode="inline" tex="a+b\choose c+d" text="(a + b) binomial (c + d)" xml:id="S1.p7.m1">
          <XMath>
            <XMDual>
              <XMApp>
                <XMRef idref="S1.p7.m1.1"/>
                <XMRef idref="S1.p7.m1.2"/>
                <XMRef idref="S1.p7.m1.3"/>
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              <XMWrap>
                <XMTok role="OPEN" stretchy="true">(</XMTok>
                <XMApp xml:id="S1.p7.m1.4">
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                    <XMTok meaning="plus" role="ADDOP">+</XMTok>
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                    <XMTok font="italic" role="UNKNOWN">d</XMTok>
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                <XMTok role="CLOSE" stretchy="true">)</XMTok>
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          </XMath>
        </Math></p>
    </para>
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