..............................................................................................................................................1 ..........................................................................................................................1 ..............................................................................................................................................9 ........................................................................................................................10 ...............................................................................................................25...............................................................................................................26...............................................................................................................26 ............................................................................................................................................31 ...................................................................................................40 ...............................................................................................................46...............................................................................................46...............................................................................................49...................................................................................51...........................................................................................51...............................................................................................................54............................................................................................................57........................................................................................................................................59 −−−−−−− −−−− −−−− − − −−−− − − −−−−− − − − − − − − − −₂ − − − ₂ ₂₂ ₂₂₂₂ ₂ 64