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

open 'pattern4a.txt' do |file|
   c = c.sub(/<a.txt>/, file.read().gsub(/\S/,'x'))
end
open 'pattern4b.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 = %{$t='s=/'+92.chr+'s/;eval$t=%{'+$t+'}.gsub(s,\"\");#';} +
    c

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

#    gsub(s,"")#
# 12345671234567

puts c