begin
  string(100) s
  string(25) left = "left"
  string(20) middle = "middle"
  string(15) right = "right"
  s = left . right
  printstring(s); newline
  s = left . middle . right
  printstring(s); newline
  s <- left . right
  printstring(s); newline
  s <- left . middle . right
  printstring(s); newline
endofprogram