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2. Toll-free telephone numbers in the North American Numbering ...

   en.wikipedia.org/wiki/Toll-free_telephone...

   Some geographic area codes are similar to the toll-free codes, e.g., 801, 818, 860. Toll-free numbers are also sometimes confused with 900-numbers, for which the telephone company bills the callers at rates far in excess of long-distance service rates for services such as recorded information or live chat.

3. List of ISO 639 language codes - Wikipedia

   en.wikipedia.org/wiki/List_of_ISO_639_language_codes

   This table lists all two-letter codes (set 1), one per language for ISO 639 macrolanguage, and some of the three-letter codes of the other sets, formerly parts 2 and 3. Entries in the Scope column distinguish: Individual language; Collections of related languages; Macrolanguages; The Type column distinguishes: Ancient languages (extinct since ...

4. List of TCP and UDP port numbers - Wikipedia

   en.wikipedia.org/wiki/List_of_TCP_and_UDP_port...

   This is a list of TCP and UDP port numbers used by protocols for operation of network applications. The Transmission Control Protocol (TCP) and the User Datagram Protocol (UDP) only need one port for duplex, bidirectional traffic. They usually use port numbers that match the services of the corresponding TCP or UDP implementation, if they exist.

5. List of GS1 country codes - Wikipedia

   en.wikipedia.org/wiki/List_of_GS1_country_codes

   Code Country 001–019: UPC-A compatible - United States: 020–029: UPC-A compatible - Used to issue restricted circulation numbers within a geographic region [1] 030–039: UPC-A compatible - United States drugs (see United States National Drug Code) 040–049: UPC-A compatible - Used to issue restricted circulation numbers within a company ...

6. Free list - Wikipedia

   en.wikipedia.org/wiki/Free_list

   This diagram represents five contiguous memory regions which each hold a pointer and a data block. The List Head points to the 2nd element, which points to the 5th, which points to the 3rd, thereby forming a linked list of available memory regions. A free list (or freelist) is a data structure used in a scheme for dynamic memory allocation.

7. List of HTTP status codes - Wikipedia

   en.wikipedia.org/wiki/List_of_HTTP_status_codes

   This class of status code indicates the client must take additional action to complete the request. Many of these status codes are used in URL redirection. [2]A user agent may carry out the additional action with no user interaction only if the method used in the second request is GET or HEAD.