By analogy with Table 1.1, determine the number and type of 2D crystal systems via considering their possible minimum symmetry elements and sketching their Bravais lattices.

Table 1.1

Crystal system Triclinic Monoclinic Orthorhombic Tetragonal Hexagonal Trigonal Cubic Minimum symmetry 1 2, m 222 4,4 6,6 3,3 23 Higher-symmetry point groups 2/m mm2, mmm 4/m, 422, 4mm, 4 2m, 4/mmm 6/m, 622, 6mm, 6m2, 6/mmm 32, 3m, 3m m3, 4 3m, 432, m3m