Twin vs Arlon

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Twins are two offspring produced by the same pregnancy. Twins can be either monozygotic ('identical'), meaning that they develop from one zygote, which splits and forms two embryos, or dizygotic ('non-identical' or 'fraternal'), meaning that each twin develops from a separate egg and each egg is fertilized by its own sperm cell.

In contrast, a fetus that develops alone in the womb (the much more common case, in humans) is called a singleton, and the general term for one offspring of a multiple birth is a multiple. Unrelated look-alikes whose resemblance parallels that of twins are referred to as doppelgangers.

Source: Wikipedia

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Arlon (French pronunciation: ​[aʁlɔ̃]; Luxembourgish: Arel, pronounced [ˈaːʀəl] (listen); Dutch: Aarlen, pronounced [ˈaːrlə(n)]; German: Arel; Walloon: Årlon) is a Walloon municipality of Belgium located in and capital of the province of Luxembourg in the Ardennes. With a population of just over 28,000, it is the smallest provincial capital in Belgium.

Arlon is also the capital of its cultural region: the Arelerland (Land of Arlon in Luxemburgish). The municipality consists of the following sub-municipalities: Arlon proper, Autelbas-Barnich, Bonnert, Guirsch, Heinsch, and Toernich. Other population centers include:

Source: Wikipedia