Lutsk vs Arch

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Lutsk (Ukrainian: Луцьк, romanized: Luts'k, IPA: [lutsʲk]; Polish: Łuck [wutsk]; Yiddish: לוצק‎, romanized: Lutzk) is a city on the Styr River in northwestern Ukraine. It is the administrative center of the Volyn Oblast (province) and the administrative center of the surrounding Lutsk Raion (district) within the oblast, though it is not a part of the raion.

Lutsk has the status of a city of oblast significance, equivalent to that of a raion. Population: 217,103 (2015 est.)

Source: Wikipedia

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An arch is a vertical curved structure that spans an elevated space and may or may not support the weight above it, or in case of a horizontal arch like an arch dam, the hydrostatic pressure against it. Arches may be synonymous with vaults, but a vault may be distinguished as a continuous arch forming a roof.

Arches appeared as early as the 2nd millennium BC in Mesopotamian brick architecture, and their systematic use started with the ancient Romans, who were the first to apply the technique to a wide range of structures.

Source: Wikipedia