learn katakanaon this trail:
- 1learn hiragana first
- 2again, "a i u e o"
- 3add "ka ki ku ke ko"
- 4add "sa shi su se so"
- 5add "ta chi tsu te to"
- 6add "na ni nu ne no"
- 7add "ha hi fu he ho"
- 8add "ma mi mu me mo"
- 9add "ya yu yo"
- 10add "ra ri ru re ro"
- 11add "wa wo n"
- 12modified characters