actinium
A playing piece in the game of checkers (British: draughts). / A pattern of alternating colours as on a chessboard. / An individual square appearing in such a pattern.
Not retractable.
A small town in Perth and Kinross council area, Scotland (OS grid ref NO1204).
A radioactive, metallic chemical element (symbol: Ac) with an atomic number of 89; found in uranium ores.
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DiQt（ディクト）
無料
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