Display a list of 50,000 items that load on demand in a viewport of only 7 rows (height=40px).
This demo shows scroll and rendering performance gains when using `md-virtual-repeat`; achieved with the dynamic reuse of rows visible in the viewport area. Developers are required to explicitly use `md-virtual-repeat-container` as a wrapping parent container.
To enable load-on-demand behavior, developers must pass in a custom instance of mdVirtualRepeatModel (see the example's source for more info).

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