Collection mark for inserted paper sections

[HYUNSEONG-KIM]

Collection mark is supported to identifying sections in collection. If one section is composed of multiple inserted sub sections, the primary section, wihch is visible section from back, section is the only one get collection mark. However, inserted sections must have an order identifiers not to be confused other subsections in gathering process.

TODO

• Add sub collection marks for each inserted sections.
  • Design indicator shape.