.23. (a) What are the two possible three-dimensional point group symmetries consistent with a triclinic unit cell? (b) Specify the number of lattice points per unit cell in each of these space groups: Pm3mI41/amdC2/c (c) Which space group is more symmetric, I4/m32/m or F4/m32/m ? Justify your answer. (d) What Bravais lattice do you expect for a crystal with space group C2/c ? (e) Identify the type of symmetry group (point, plane, or space) represented by each of these international symbols, and within each set of symbols, identify the meaning of the various characters: (i) 2/m3; (ii) p2gg; and (iii) I41/acd