0 a K 1 D 0 ( K 3 ( 0 [ K 3 [ 1 + D 2 O 1 - D 2 O 1 * D 2 O 1 / D 2 O 1 ) D 4 b 1 ] D 7 b 1 x D 6 b 2 a O 1 b 2 ( O 3 ( 2 [ O 3 [ 3 a ( 1 D 3 a [ 1 D 3 ( ( 3 ( 3 ( [ 3 ( 3 [ [ 3 [ 3 [ ( 3 [ 4 x ( 5 b 5 x D 1 x 5 x K 1 D 5 x O 1 b 5 x ( 1 D 5 x [ 1 D 6 x K 6 b 7 x [ 5 b