甲乙丙丁

こうおつへいてい

noun

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A, B, C and D, first, second, third and fourth

甲	armor, high (voice), A grade, first class, former, instep, carapace
乙	the latter, duplicate, strange, witty, fishhook radical (no. 5)
丙	third class, 3rd, 3rd calendar sign
丁	street, ward, town, counter for guns, tools, leaves or cakes of something, even number, 4th calendar sign