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#!/usr/bin/env ruby
n = ARGV.shift.to_i
m = n
m = ((m / 8) + 1) * 8 if m % 8 != 0
p = (1..n).map(&:to_s) + ["{}"] * (m - n)
o = []
until p.empty? do
t1 = []
t2 = []
t1.push(p.pop)
t1.push(p.shift)
t2.push(p.shift)
t2.push(p.pop)
t1.push(p.pop)
t1.push(p.shift)
t2.push(p.shift)
t2.push(p.pop)
o += t1
o += t2
end
f = ARGV.shift
if f.nil?
puts o.join(?,)
else
puts "pdfjam --nup 2x2 -o #{File.basename(f, ".*")}-book.pdf #{f} #{o.join(?,)}"
end
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