shithub: kwa

ref: c0526c8928a2b554d9421bca2fc04ba044fe06af
dir: /test/t.split3/

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{ a = $0 " " $0 " " $0
  if ($1 != "")
      n = split (a, x, "[" $1 "]")
  print n, x[1], x[2], x[3], x[4] }