2 5 5 11 July 8, 2019 16 32 64 128 5 2 5 11 height difference 2 5 x 5 11 2 1 5 5 11 4 5 2 5 11 5 2 compared 5 11 5 2 6 5 )+ 11 2 11 5 5 9 5 2 5 11 comparison