Concentration Grid – 7×7 grid in 49.23 sec Concentration Grid 7 years ago Concentration Grid – 7×7 grid in 49.23 sec GRID_ID100-C7R7-GR49T49.226 33N0.233-22X3.967-N-DT20161108-071744 www.concentrationgrid.com www.facebook.com/concentrationgrid www.twitter.com/ConcentrationGr Sent from my iPad Pro