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коробовой свод | |||
трёхцентровая арка | |||
трёхцентровая арка (A round arch whose inner curve is drawn with circles having three centres Alexander Demidov); овальная арка | |||
коробовой свод | |||
трёхцентровая арка (A round arch whose inner curve is drawn with circles having three centres – АД) | |||
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коробовая арка |