languages set

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What do all the checked languages displaying when on the Review tab> Language
mean? I am viewing this when I am in outline view and have all content in the
slide show selected. U.S English appears at the top, but as I scroll down I
found all versions of English have a check as do al the versions of French
and Spanish. Are these available dictionaries that come with a standard
loading of Office 2007 for U.S customers of Microsoft Office? If so, do these
other available dictionaries in any way affect spell checking?

Guidance would be appreciated.
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