Different combinations of these cases can cause conflict. Additionally, user groups can attempt to provide additional characters in the PUA. In other cases, a manufacturer might provide a custom set of characters in one of these ranges. Some code pages have extensions that reuse the EUDC range, and these extensions can conflict with each other. The EUDC and PUA characters can be assigned differently, or not assigned at all, on different computers. Their use enables users to form names and other words using characters that are not available in standard screen and printer fonts. They can be defined and implemented either by an end user or by another party, such as an equipment manufacturer, a user group, a government body, or a font design company. End-user-defined characters (EUDC) in double-byte character sets (DBCSs) and private use area (PUA) characters in Unicode are custom characters.
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