#!/usr/bin/ruby

for i in 1..4
  for j in 1..i
    print "(",i + 1 - j,",",j,") "
  end
  print "\n"
end

=begin
endless version of above program

i = 1
while true
  for j in 1..i
    print "(",i + 1 - j,",",j,") "
  end
  print "\n"
  i += 1
end

=end