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@@ -10829,9 +10829,10 @@ data between frames, or to properly close a @code{column} environment.
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Headlines also support @code{BEAMER_ACT} and @code{BEAMER_OPT} properties.
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The former is translated as an overlay/action specification, or a default
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overlay specification when enclosed within square brackets. The latter
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-specifies options for the current frame. Though, @code{fragile} option is
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-added automatically if it contains source code that uses any verbatim
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-environment.
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+specifies options@footnote{The @code{fragile} option is added automatically
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+if it contains code that requires a verbatim environment, though.} for the
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+current frame or block. The export back-end will automatically wrap
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+properties within angular or square brackets when appropriate.
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@cindex property, BEAMER_COL
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Moreover, headlines handle the @code{BEAMER_COL} property. Its value should
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Nicolas Goaziou