Done.

http://www.techscore.com/tech/Ruby/Lang/Basic4/4-1/
http://www.techscore.com/tech/Ruby/Lang/Basic4/4-2/
Done.

http://www.techscore.com/tech/Ruby/Lang/Basic5/5-1/
http://www.techscore.com/tech/Ruby/Lang/Basic5/5-2/
Done.

http://www.techscore.com/tech/Ruby/Lang/Basic6/