Sumy vs Twin

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Sumy (Ukrainian: Суми [ˈsumɪ] (listen)) is a city in north-eastern Ukraine, and the capital of Sumy Oblast (region). Sumy also serves as the administrative center of Sumy Raion of Sumy oblast.

Sumy is administratively incorporated as a city of oblast significance and does not belong to the raion. The population estimate is 264,981 (2020 est.)

Source: Wikipedia

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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