Infinite Loop Problem

Hi all,

I'm new to ruby, and I'm Having trouble with my code. It's an exercise for learning ruby, and I'm plowing through it. The explanation of the exercise is this:

For each person in your group, you want to assign a "spy" such that no one spies on themselves or someone with the same last name.

Input: A file you will name "people.txt" of the form:

Luke Skywalker <luke@theforce.net>
Leia Skywalker <leia@therebellion.org>
John Wayne <John@Western.com>
Clark Kent <super@gmail.com>
Lois Ken <super2@gmail.com>
Pop Eye <popeye@gmail.com>
Private Eye <wise@gmail.com>
Robotic Eye <me@gmail.com>
Vicki Allan <Vicki.Allan@usu.edu>
Joe Allan <joeTheAllan@usu.edu>
Terrance Allan <Terry.All@gmail.com>
Philip Allan <PhilDoll@gmail.com>

That's the text file I have to work with. It has all those random spacings in there for a reason, so it's a bit trickier to get the right input. Here's my implementation:

class People # Contains all information about a person
attr_accessor :fname, :lname, :email, :found
def initialize(fname, lname, email,found)
@fname = fname
@lname = lname
@email = email
@found = found
end
end
#========================================================================

# This method gets all the names, and puts them in a string, line by line
def get_the_names()
people_array = IO.readlines("people.txt")
people_array
end
#========================================================================

#counts the lines in the file
count = 0
File.open("people.txt", 'r') { |fh|
count += 1 while fh.gets
}
#========================================================================

#the raw names, gotten from get_the_names()
raw_names = get_the_names()
#========================================================================

#Takes the raw_names, strips them, and puts them into
#an array called "stripped"
stripped = Array.new(count)
count.times { |index|
stripped[index] = raw_names[index].scan(/\w+/)
}
#========================================================================


#make the array of People objects
spies = Array.new(count)
for i in 0..(count-1) do
#this command re-creates the email address, because it was split into 3 parts
email = "<" + stripped[i][2] + "@" + stripped[i][3] + "." + stripped[i][4] + ">"
#0 will always be fname, and 1 will always be last name, which is why they're hard-coded
spies[i] = People.new(stripped[i][0],stripped[i][1],email,false)
end
#========================================================================


#perform some spying! Making sure no one spies on themselves,
#or someone with their same last name
r_spies = spies.sort_by{ rand }
rand_spies = r_spies.dup

found = 12
index = 0

while found > 0 do
for k in 0..spies.length()-1 do
for l in 0..rand_spies.length()-1 do
if spies[k].lname == rand_spies[l].lname
next
end
if spies[k].email.to_s == rand_spies[l].email.to_s
next
end
if spies[k].found == true || rand_spies[l].found == true
next
end
spies[k].found = true
rand_spies[l].found = true
puts "Person " + spies[k].fname.to_s + " " + spies[k].lname.to_s + " at " + spies[k].email.to_s + " spies on " + "Person " + rand_spies[l].fname.to_s + " " + rand_spies[l].lname.to_s + " at " + rand_spies[l].email.to_s
found = found-1
end
end
end

The problem is this: It correctly spies on 6 people, but it hangs on an infinite loop after the 6th one, and I can't figure it out. Any help would be GREATLY appreciated.