c = %{f=[',','<a.txt>','<b.txt>'][rand(2)+1].split("\n") 
f=rand(2)>0?f:f.reverse
f=rand(2)>0?f:f.map{|e|e.reverse}
$t='s=/'+92.chr+'s/;eval$t=%{'+$t+'}.gsub(s,"");#'
p=''
i=-1
f.map{|e|e.sub(/\s*$/,"")}.join("\n").each_char{|e|p+=e=="x"?$t[i+=1]:e}
puts p}

open 'pattern5a.txt' do |file|
   c = c.sub(/<a.txt>/, file.read().gsub(/\S/,'x'))
end
open 'pattern5b.txt' do |file|
   c = c.sub(/<b.txt>/, file.read().gsub(/\S/,'x'))
end

require 'zlib'
c = [Zlib::Deflate.deflate(c, 9)].pack('m').gsub(/\n/, '')

c = "require'zlib';eval(Zlib::Inflate.inflate('" +
    c +
    "'.unpack('m')[0]))"

c = 's=/' + 92.chr + 's/;eval$t=%{' + c + '}.gsub(s,"");#'

puts c