onds exactly to
  this index. If this index does not have an exact corresponding
  position in <code>characters</code>, this method returns <code>nil</code>. For example,
  an attempt to convert the position of a UTF-8 continuation byte
  returns <code>nil</code>.</p>

    <h4>Declaration</h4>    
    <code class="language-swift">func samePosition(in characters: String) -&gt; Index?</code>
    
    
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