jQuery UI required components for custom scrollbar plugin 

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UI Core: 
Core - The core of jQuery UI, required for all interactions and widgets.
Widget - Provides a factory for creating stateful widgets with a common API.
Mouse - Abstracts mouse-based interactions to assist in creating certain widgets.

Interactions: 
Draggable - Enables dragging functionality for any element.

Effects: 
Effects Core - Extends the internal jQuery effects. Includes morphing and easing. Required by all other effects.