Can you spot the problem here?

Hit a EXC_BAD_ACCESS exception.

In the lldb, I tried to interrogate some internal variable, but no success.

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(lldb) p [lessons count]
error: no known method '-count'; cast the message send to the method's return type
error: 1 errors parsing expression

New stuff

http://developer.apple.com/library/ios/#documentation/FileManagement/Conceptual/FileSystemProgrammingGUide/TechniquesforReadingandWritingCustomFiles/TechniquesforReadingandWritingCustomFiles.html

http://developer.apple.com/library/ios/#documentation/FileManagement/Conceptual/FileSystemProgrammingGUide/TechniquesforReadingandWritingCustomFiles/TechniquesforReadingandWritingCustomFiles.html

Justinian I

Very fascinating. He commissioned to build Hagia Sophia which was completed in less than 6 years. Remarkable.

http://ftp.gnu.org/gnu/glpk/