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3.9. The symmetry elements in one unit cell of plane group No. 5. cm. are illus- trated in the accompanying gure. A standard representation of an asymmetric object (an open circle) has been placed in an arbitrary point x. y in the unit cell shown on the right. ID (it) Use the symmetry elements present in the plane group to repeat the single object. Draw all additional symmetry-related objects in their proper lo- cations in the cell shown in the gure. Use a circle with a comma inside to represent the enantiomorph of the asymmetric object. ('3) What is the site symmetry at the general position x, y? What is the site symmetry at the special position %, ? (c) If the general position x. y is occupied in this plane group. what are the coordinates of all other symmetry-related objects that lie within the con- ventional unit cell? ((0 How many lattice points are there per unit cell? How many eqm'mints are there per unit cell? (e) Draw in and label the conventional lattice translation vectors t. and t; on a copy of the gure