in
used to indicate that something or someone is part of a particular group, place, or thing

안에, 중에

[전치사]
on
used to indicate that something is included as part of a group, category, or set

~에 포함되어 있는, ~의 일부로

[전치사]
under
included or categorized as part of a particular group, category, or set

~의 범주에 포함되는, ~에 해당하는

[전치사]

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