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class Array
  def sieve (*how)
...
  Proc.new { |n| n < 5 },
  Proc.new { |n| n < 10 }
) { |x| x * 2 }.inspect

sieve {block 1}.{block 2}.{block 3}.sift(array) {how}

this_sieve = sieve {b1}.{b2}.{b3}
# and then
this_sieve.sift(array) { how }