4-sided stud
https://gyazo.com/c6dd1b2946db73b6761c3e3c3756b2f9
https://www.brickers.jp/?mode=cate&cbid=1131409&csid=5
Block 1 x 1 - 4-sided studs
Block 1x1 - 4-sided stud
Lego joint
Lego
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