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require 'prime'
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PRIMES = Prime.each(1_000_000).to_a
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difs = [[2], [1], [2,2], [2,4], [4,2], [6,4,2]]
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difs.each do |ar|
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res = PRIMES.each_cons(ar.size+1).select do |slice|
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slice.each_cons(2).zip(ar).all? {|(a,b), c| a+c == b}
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end
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puts "#{ar} has #{res.size} sets. #{res.first}...#{res.last}"
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end
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