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

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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