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A
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B
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C
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E
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F
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G
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H
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I
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K
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L
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M
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P
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Q
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R
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S
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V
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W
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Keystone
1. In masonry, the central, often embelished, voussoir of an arch. Until the keystone is in place, no true arch action is incurred.
2. An element resembling a keystone in function or in shape. *
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* Dictionary of Architecture & Construction, by Cyril M. Harris
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