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        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_UNCONFIRMED "
   title="UNCONFIRMED - Formulareditor: failed to interpret indizes in case "a_ni""
   href="https://bugs.documentfoundation.org/show_bug.cgi?id=111573">111573</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Formulareditor: failed to interpret indizes in case "a_ni"
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>LibreOffice
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>5.1.5.2 release
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>All
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>Windows (All)
          </td>
        </tr>

        <tr>
          <th>Status</th>
          <td>UNCONFIRMED
          </td>
        </tr>

        <tr>
          <th>Severity</th>
          <td>normal
          </td>
        </tr>

        <tr>
          <th>Priority</th>
          <td>medium
          </td>
        </tr>

        <tr>
          <th>Component</th>
          <td>Writer
          </td>
        </tr>

        <tr>
          <th>Assignee</th>
          <td>libreoffice-bugs@lists.freedesktop.org
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>lueolli@web.de
          </td>
        </tr></table>
      <p>
        <div>
        <pre>Description:
bug = red question mark in formula

a_ni //bug
a_nI //bug
a_Ni //bug
a_NI //bug
a_in //bug
a_iN //bug
a_IN //bug
a_{ni} //bug
b_ni //bug

a_11 //works
a_aa //works
a_a1 //works
a_mi //works
a_n1 //works
a_nii //works

Description when it failed: 

IF 2-sign indizes 
AND one sign "n" another "i", any combination, any upper/lower-case




Steps to Reproduce:
Copy in formula-editor for test:

a_11 = a_nn = a_ni = a_in = a_Ni = a_nI = a_nni = a_nii

Actual Results:  
red question mark in formula

Expected Results:
correct representation of indizes a_ni


Reproducible: Always

User Profile Reset: No

Additional Info:
[Information automatically included from LibreOffice]
Locale: de
Module: TextDocument
[Information guessed from browser]
OS: Windows (All)
OS is 64bit: yes

//Info LibreOffice
Version: 5.1.5.2
Build-ID: 7a864d8825610a8c07cfc3bc01dd4fce6a9447e5
CPU-Threads: 8; BS-Version: Windows 6.1; UI-Render: Standard; 
Gebietsschema: de-DE (de_DE); Calc: CL
Builds ID: LibreOffice 5.1.5.2


User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:54.0) Gecko/20100101
Firefox/54.0</pre>
        </div>
      </p>


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