ag-gipp/GoUldI

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        <expression prime-tag="underscore" secondary-tags="subscript_operation">
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        <term prime-tag="left parenthesis" secondary-tags="opening delimiter">(</term>
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            <term prime-tag="digit" secondary-tags="numeric">1</term>
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        <expression prime-tag="underscore" secondary-tags="subscript_operation">
          <term prime-tag="digit" secondary-tags="numeric">1</term>
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          <term prime-tag="letter" secondary-tags="Latin">x</term>
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        <term prime-tag="right parenthesis" secondary-tags="closing delimiter">)</term>
        <term prime-tag="letter" secondary-tags="Latin">z</term>
        <expression prime-tag="underscore" secondary-tags="subscript_operation">
          <term prime-tag="digit" secondary-tags="numeric">1</term>
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      <expression prime-tag="underscore" secondary-tags="subscript_operation">
        <expression prime-tag="sequence" secondary-tags="subscript">
          <term prime-tag="letter" secondary-tags="Latin, accented">x</term>
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            <expression prime-tag="sequence" secondary-tags="numerator">
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              <term prime-tag="letter" secondary-tags="Latin">d</term>
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        <expression prime-tag="underscore" secondary-tags="subscript_operation">
          <term prime-tag="letter" secondary-tags="Latin">x</term>
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          <expression prime-tag="sequence" secondary-tags="numerator">
            <term prime-tag="latex-command">\operatorname</term>
            <term prime-tag="letter" secondary-tags="Latin">d</term>
            <term prime-tag="letter" secondary-tags="Latin">u</term>
            <expression prime-tag="underscore" secondary-tags="subscript_operation">
              <term prime-tag="letter" secondary-tags="Latin">x</term>
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          <expression prime-tag="sequence" secondary-tags="denominator">
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            <term prime-tag="letter" secondary-tags="Latin">d</term>
            <term prime-tag="letter" secondary-tags="Latin">t</term>
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