easily recognizable code造句

Codes ending in double digits are reserved as " easily recognizable codes " ( ERCs ), to be used for special purposes such as toll-free numbers, personal Las Vegas metropolitan area.
Area codes with the last two digits matching, such as " 322 " and " 755 ", are considered easily recognizable codes ( ERC ), and are also reserved; existing assignments are the toll-free codes 800, 888, 877, 866, 855, and 844.
It's difficult to find easily recognizable code in a sentence. 用easily recognizable code造句挺难的