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GtkAlignment — A widget which controls the alignment and size of its child
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GtkAspectFrame — A frame that constrains its child to a particular aspect ratio
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GtkHBox — A horizontal container box
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GtkVBox — A vertical container box
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GtkHButtonBox — A container for arranging buttons horizontally
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GtkVButtonBox — A container for arranging buttons vertically
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GtkFixed — A container which allows you to position widgets at fixed coordinates
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GtkHPaned — A container with two panes arranged horizontally
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GtkVPaned — A container with two panes arranged vertically
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GtkLayout — 
Infinite scrollable area containing child widgets and/or custom drawing
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GtkNotebook — A tabbed notebook container
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GtkTable — Pack widgets in regular patterns
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GtkExpander — A container which can hide its child