// This is a generic paginator for album, photo and movie pages.  Depending on the page type,
// there are different sets of variables available.  With this data, you can make a paginator
// that lets you say "You're viewing photo 5 of 35", or "You're viewing photos 10 - 18 of 37"
// for album views.
//
// Available variables for all page types:
//   $page_type               - "collection", "item", or "other"
//   $page_subtype            - "album", "movie", "photo", "tag", etc.
//   $previous_page_url       - the url to the previous page, if there is one
//   $next_page_url           - the url to the next page, if there is one
//   $total                   - the total number of photos in this album
//
// Available for the "collection" page types:
//   $page                    - what page number we're on
//   $max_pages               - the maximum page number
//   $page_size               - the page size
//   $first_page_url          - the url to the first page, or null if we're on the first page
//   $last_page_url           - the url to the last page, or null if we're on the last page
//   $first_visible_position  - the position number of the first visible photo on this page
//   $last_visible_position   - the position number of the last visible photo on this page
//
// Available for "item" page types:
//   $position                - the position number of this photo
//
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