writing control pen [20 pages of single book]] writing stroke 1 [20 pages per book]] writing stroke 2 [20 pages of single book]] a [20 pages of a single book]] two [20 pages of single book]] three [20 pages of single book]] writing high-frequency common words [20 pages per book]] writing high-frequency common word 2 [20 pages of single book]] writing high-frequency common words three [20 pages per book]] writing high-frequency common words four [20 pages per book]]

color