pda 31.0 77.0 183.0 77.0 342.0 77.0 515.0 77.0 430.0 179.0 263.0 179.0 1 1 a a aa 3 3 b b bb 4 4 c b 1 2 b a 2 2 b a 3 4 c b 2 3 b z bz 4 5 z z 0 1 a z az