im going to assume the first file has 6 or MORE line in it, or else your in the poo.

Code:
alias example {
  var %list
  var %i = 6
  while (%i) {
    var %text = $read(firstfile.txt,nt) | while ($istok(%list,$readn,32)) { var %text = $read(firstfile.txt,nt) }
    var %list = %list $readn
    write secondfile.txt %text
    dec %i
  }
}

* code untested, should work tho.