YOU SAID:
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INTO JAPANESE
qwertyuiopasdfghjklzxcvbnmqwertyuiopasdfghjklzxcvbnm
BACK INTO ENGLISH
qwertyuiopahidfghjklzxcvbnmqwertyuiopahidfghjklzxcvbnm
INTO JAPANESE
qwertyuiopahidfghjklzxcvbnmqwertyuiopahidfghjklzxcvbnm
BACK INTO ENGLISH
qwertyuiopahidfghjklzxcvbnmqwertyuiopahidfghjklzxcvbnm
You've done this before, haven't you.