R 4 5 6 July 8, 2019 16 32 64 128 R 3 4 5 6 1 2 r /- 4 5 6 R 1 2 3 4 5 6 3r 4 r 6 5 R c t 4 6 5 1 2 r /- 4 ≤ 5 6 6 1 4 r 5 6 r 4 )( r 5 )= 0 Zoning r 1 2 3 4 5 6 5p 4 r )= 6p 5 r 1