define line() {
  pen(1)
  repeat(10) { forward(60) }
}

define seed() {
  repeat(9) {
    right(90)
    forward(60)
    left(90)
    split { line() }
  }
}

forward(300)right(90)forward(-300)

split { seed() }
forward(600)right(90)
split { seed() }