8.1 keystone

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Galleries
Gregor (ZZ) -
1.1 wing 1.2 2.1 atrium 2.2 3.1 3.2 lierne 4.1 4.2 lunette 5.1 pergola 5.2 6.1 arcade 6.2 7.1 colonnade 7.2 8.1 keystone 8.2 8.3 9.1 cornerstone 9.2 a.1 ogive a.2 b.1 apse b.2 b.3 c.1 alcove c.2 c.3 d.1 parapet d.2 d.3 e.1 e.2 capital e.3 f.1 f.2 cantilever