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Tony Magro committed 931d332

Fixed small typo in Tutorial 07.xml

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Documents/Positioning/Tutorial 07.xml

                 looking.</para>
             <para>The implementation of this function is non-trivial. We will not go into detail
                 explaining how it works, as it involves a lot of complex math concepts that have not
-                been introduced. Using the function is is much easier than understanding how it
+                been introduced. Using the function is much easier than understanding how it
                 works. Even so, there is one major caveat with this function (and any function of
                 the like).</para>
             <para>It is very important that the <quote>up</quote> direction is not along the same