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12. Photo by Wonderlane - http://www.flickr.com/photos/wonderlane/3543159454/

13. Photo by Charles LeBlanc - http://www.flickr.com/photos/httpoldmaisonblogspotcom/4120098793/

14. Photo by James Vaughan - http://www.flickr.com/photos/x-ray_delta_one/4547437970/

15. Photo by Leon Fishman - http://www.flickr.com/photos/leonfishman/6858548064/

16. Photo by Alan Turkus - http://www.flickr.com/photos/aturkus/2569696486/

19. Photo by Ed Yourdon - http://www.flickr.com/photos/yourdon/2626095227/

21. Photo by dualdflipflop - http://www.flickr.com/photos/duald/7375852452/

23. Photo by Thomas Leuthard - http://www.flickr.com/photos/thomasleuthard/5725478270/

24. Photo by Nagesh Jayaraman - http://www.flickr.com/photos/howard_roark/4685772832/

25. Photo by seyed mostafa zamani - http://www.flickr.com/photos/seyyed_mostafa_zamani/4259815196/

26. Photo by dadblunders - http://www.flickr.com/photos/sahdblunders/8644936719/

27. Photo by Rolands Lakis - http://www.flickr.com/photos/rolandslakis/109745527/

28. Photo by KΛ13 - http://www.flickr.com/photos/cata13es/6127697084/

29. Photo by Davidlohr Bueso - http://www.flickr.com/photos/daverugby83/5145190557/

30. Photo by Jes - http://www.flickr.com/photos/mugley/1359342963/

31. Photo by Alosh Bennett - http://www.flickr.com/photos/aloshbennett/1105362452/

32. Photo by seyed mostafa zamani - http://www.flickr.com/photos/seyyed_mostafa_zamani/6966965057/