#! /usr/local/bin/ruby

t=5
padsize=6


(1000..2500).each do |j|
  i = (j*t).to_s.rjust(padsize,'0')
  system "pngtopnm #{j}.png > #{i}.pnm"
  (1..t-1).each do |tt|
    tt_pad = (i.to_i+tt).to_s.rjust(padsize,'0')
    system "ln #{i}.pnm #{tt_pad}.pnm"
  end
end