kturtle-script-v1.0
@(learn) a $n {
  $n = $n - 2
  @(fw) 10
  @(print) "a: " + $n
	@(if) $n <= 0 {
    @(return)
	}
  b $n
}

@(learn) b $n {
  $n = $n - 1
  @(fw) 10
  @(print) "b: " + $n
	@(if) $n <= 0 {
    @(return)
	}
  a $n
}

@(reset)
a 20