are to be reflected before the original scene number, as what follow a scene number identifies a specific setup within the scene actually shot during production. For example: For US production standards if a new scene is to be inserted between scenes 10 and 11, the new scene will be numbered A11 (and not 10A as "10A" would refer to setup "A" of scene 10, when using the American slating system – see slating procedures). For some productions, it may be necessary to insert a scene between 10 and A11 – this scene is then numbered AA11. A scene between A11 and 11 would be numbered B11. A scene between A11 and B11 would be numbered AB11. For UK production standards if a new scene is to be inserted between scenes 10 and 11, the new scene will be numbered 10A. Where it is necessary to insert a scene between 10 and 10A – this scene is then numbered 10aA. A scene between 10A and 11 would be numbered 10B . A scene between 10A and 10B would be numbered 10AA. Every scene thus retains its own unique number throughout the course of the production. When a scene is omitted, its number is preserved in the script along with the phrase (OMITTED). This effectively retires the number so that it cannot be reused by a new scene inserted later at the same location. A scene can also be unomitted, effectively bringing the retired scene out of retirement. Page numbers in a shooting script are handled in a similar way. When revision pages are distributed, the page numbers must flow sequentially into the pre-existing page numbers. For example, if page 10 is revised such that it now occupies a page and a half, the revisions will be distributed on two pages numbered 10 and 10A. These two pages will replace page 10 in the outstanding drafts. Conversely, if pages 15 and 16 are shortened such that they now can occupy a single page, the revisions will be distributed on a single page numbered 15-16, or blank space is retained on each page to maintain the original page numbering, ie 14 as is, 15 half blank, 16 half blank, 17 as is. Revision slug A slug (header) appears at the top of every revision page, aligned vertically with the page number. The revision slug typically includes the date the revisions were circulated,