4in3x3B
#構造
https://scrapbox.io/files/61d54243506822001d328670.png
構成
2in3x1
x4
共有構造
問題
11x11
(
2019-12-08
) author: mukki
13x13
(
2020-02-08
) author: 薄廻
13x13
(
2021-09-18
) author: 薄廻