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For questions about the ways in which children learning Japanese (as a first language) speak differently from adults.
A moribund language spoken by some Ainu, an indigenous people mainly living in the island of Hokkaido. It is not regarded as related to Japanese.
characters that cannot be represented on a computer using a given character encoding system.
variant forms of hiragana that were used prior to 1900, but which are no longer in use.
Questions regarding the ko/so/a/do word series
verbs like たべる and おきる, which conjugate after dropping the terminal る, e.g. たべない, たべます, たべる, たべれば, たべよう.