Examples and code from lab8 for group 2 and 3
Adding swap-cols function
Adding grades and solutions to homework7 for lab1.
Adding rar with past exams
Add filter and reduce implementation
Add the results of the sixth homework
Adding a cheat sheet of built-in Scheme functions.
Fixing typo.
Merge branch 'master' of https://github.com/IvanIvanov/fp2013 into my-solutions
Add my solutions to lab1's homework #7