Draw the chiral vector Ch of a carbon nanotube with (n,m) = (5,0), (n,m) = (4,4) and (n,m) = (3,5). (Hint: Insert the lattice points and the corresponding basis vectors (a1,a2) into  the  honeycomb  lattice  given  below.  Choose  an  arbitrary  atom as the origin.) Describe the electrical properties (conductor or semiconductor) of each nanotube. ??