A unit cell of diamond is a cube of side A, with carbon atoms at each corner, at the centre of each face and, in addition, at positions displaced by A(i+j+ k) from each of those already mentioned; i, j, k are unit vectors along the cube axes. One corner of the cube is taken as the origin of coordinates. What are the vectors joining the atom at A(i+j+k) to its four nearest neighbours? Determine the angle between the carbon bonds in diamond.

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