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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 | |||
