Deteriorating infrastructure—DSL networks include the US, although the copper wires that make up these networks are considerably more liable to corrosion and deterioration than fiber-optic cables. Also, continue to keep the 2nd "e" when there's a double "e" at the end of the phrase, including "see" in "seeable" or "flee" https://spelling-rules-for-ssc-cg87642.bloggazzo.com/27609034/dsl-spoken-things-to-know-before-you-buy