Skip spelling check for same text in PowerPoint

Like Microsoft Word, PowerPoint allows skipping such text when spell checking. For example, the word erors is skipped:

To skip selected text during spell checking, follow these steps:

   1.   Select the text you want to skip.

   2.   On the Review tab, in the Language group, select the Language list and then choose Set Proofing Language...:

   3.   In the Language dialog box, click the Do not check spelling checkbox:

   4.   Click OK.