Source google image: https://www.repubrick.com/images/stories/virtuemart/product/995.170224.091041_o0ger_assembly_square_mini_modular.lxf.png
Lego instructions assembly square
Source google image: https://www.repubrick.com/images/stories/virtuemart/product/995.170224.091041_o0ger_assembly_square_mini_modular.lxf.png