日本地図（map-full.svg と、index.html の中の ）について
もとデータ : Geolonia / japanese-prefectures
https://github.com/geolonia/japanese-prefectures
配布元の定め: 「この SVG データは、Wikipedia の 日本地図.svg をベースにしており、
ライセンスは GFDL とします。」（配布元の README「ライセンス」の節）
もとの地図 : Lincun 作「日本地図.svg」（Wikipedia／Wikimedia Commons）
https://commons.wikimedia.org/wiki/File:Japan_Map_Lincun.svg
版 : 配布元は版を指定していないため、GFDL 第10節により 1.3 を選びました。
写し方 : 配布元のファイルと同じ中身のまま使っています（手を加えていません）。
注意 : GFDL 第2節により、この地図には、とあ先生のツールボックスの
「売り物にしない」「内容を改変しない」などの条件はかかりません。
The map data above is used verbatim under the GNU Free Documentation License.
Original map: "日本地図.svg" (Japan Map) by Lincun, Wikimedia Commons.
The distributor does not specify a version; version 1.3 is chosen (section 10).
========================================================================
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