21. But Tuesday's attacks are a reminder of just how easily major structures can be reached. 22. Thirteen major structures have been built on the site to date, some several stories tall. 23. The primary target is usually a major structure like an enemy base or a bridge. 24. Many of the houses in Akrotiri are major structures , some of them three storeys high. 25. The line generally followed contours, and there was only one major structure , the Cannington Viaduct. 26. There are 3 major structures , with the main building being the oldest and heritage complex. 27. The major structures of Q'umarkaj were laid out around a plaza, which had a plaster floor. 28. These were in addition to the existing major structures , the Maharaja's College and Ernakulam General Hospital. 29. In 1929, extensive track and major structures were put down in the most permanent manner possible. 30. The two major structures used in self-avoidance studies are the somatosensory neurons in " Drosophila ".
