inner 1 l1 1 1 r1 \N 1 l1 1 1 r2 \N 2 l2 2 2 r3 \N 2 l3 3 2 r3 \N 3 l4 4 3 r4 \N 3 l4 4 3 r5 \N 4 l5 \N 4 r6 nr6 4 l6 \N 4 r6 nr6 9 l9 \N 9 r9 nr9 inner subs 1 l1 1 1 r1 \N 1 l1 1 1 r2 \N 2 l2 2 2 r3 \N 2 l3 3 2 r3 \N 3 l4 4 3 r4 \N 3 l4 4 3 r5 \N 4 l5 \N 4 r6 nr6 4 l6 \N 4 r6 nr6 9 l9 \N 9 r9 nr9 inner expr 1 l1 1 1 r1 \N 1 l1 1 1 r2 \N 2 l2 2 2 r3 \N 2 l3 3 2 r3 \N 3 l4 4 3 r4 \N 3 l4 4 3 r5 \N 4 l5 \N 4 r6 nr6 4 l6 \N 4 r6 nr6 9 l9 \N 9 r9 nr9 left 1 l1 1 1 r1 \N 1 l1 1 1 r2 \N 2 l2 2 2 r3 \N 2 l3 3 2 r3 \N 3 l4 4 3 r4 \N 3 l4 4 3 r5 \N 4 l5 \N 4 r6 nr6 4 l6 \N 4 r6 nr6 5 l7 \N 0 \N 8 l8 \N 0 \N 9 l9 \N 9 r9 nr9 left subs 1 l1 1 1 r1 \N 1 l1 1 1 r2 \N 2 l2 2 2 r3 \N 2 l3 3 2 r3 \N 3 l4 4 3 r4 \N 3 l4 4 3 r5 \N 4 l5 \N 4 r6 nr6 4 l6 \N 4 r6 nr6 5 l7 \N 0 \N 8 l8 \N 0 \N 9 l9 \N 9 r9 nr9 left expr 1 l1 1 1 r1 \N 1 l1 1 1 r2 \N 2 l2 2 2 r3 \N 2 l3 3 2 r3 \N 3 l4 4 3 r4 \N 3 l4 4 3 r5 \N 4 l5 \N 4 r6 nr6 4 l6 \N 4 r6 nr6 5 l7 \N 0 \N 8 l8 \N 0 \N 9 l9 \N 9 r9 nr9 right 0 \N 6 r7 nr7 0 \N 7 r8 nr8 1 l1 1 1 r1 \N 1 l1 1 1 r2 \N 2 l2 2 2 r3 \N 2 l3 3 2 r3 \N 3 l4 4 3 r4 \N 3 l4 4 3 r5 \N 4 l5 \N 4 r6 nr6 4 l6 \N 4 r6 nr6 9 l9 \N 9 r9 nr9 right subs 0 \N 6 r7 nr7 0 \N 7 r8 nr8 1 l1 1 1 r1 \N 1 l1 1 1 r2 \N 2 l2 2 2 r3 \N 2 l3 3 2 r3 \N 3 l4 4 3 r4 \N 3 l4 4 3 r5 \N 4 l5 \N 4 r6 nr6 4 l6 \N 4 r6 nr6 9 l9 \N 9 r9 nr9 full 0 \N 6 r7 nr7 0 \N 7 r8 nr8 1 l1 1 1 r1 \N 1 l1 1 1 r2 \N 2 l2 2 2 r3 \N 2 l3 3 2 r3 \N 3 l4 4 3 r4 \N 3 l4 4 3 r5 \N 4 l5 \N 4 r6 nr6 4 l6 \N 4 r6 nr6 5 l7 \N 0 \N 8 l8 \N 0 \N 9 l9 \N 9 r9 nr9 full subs 0 \N 6 r7 nr7 0 \N 7 r8 nr8 1 l1 1 1 r1 \N 1 l1 1 1 r2 \N 2 l2 2 2 r3 \N 2 l3 3 2 r3 \N 3 l4 4 3 r4 \N 3 l4 4 3 r5 \N 4 l5 \N 4 r6 nr6 4 l6 \N 4 r6 nr6 5 l7 \N 0 \N 8 l8 \N 0 \N 9 l9 \N 9 r9 nr9 self inner 1 l1 1 1 l1 1 2 l2 2 2 l2 2 2 l2 2 2 l3 3 2 l3 3 2 l2 2 2 l3 3 2 l3 3 3 l4 4 3 l4 4 4 l5 \N 4 l5 \N 4 l5 \N 4 l6 \N 4 l6 \N 4 l5 \N 4 l6 \N 4 l6 \N 5 l7 \N 5 l7 \N 8 l8 \N 8 l8 \N 9 l9 \N 9 l9 \N self inner nullable 1 l1 1 1 l1 1 2 l2 2 2 l2 2 2 l3 3 2 l3 3 3 l4 4 3 l4 4 self inner nullable vs not nullable 1 l1 1 1 l1 1 2 l2 2 2 l2 2 2 l3 3 2 l2 2 3 l4 4 2 l3 3 4 l5 \N 3 l4 4 4 l6 \N 3 l4 4 self inner nullable vs not nullable 2 4 r6 nr6 4 r6 nr6 6 r7 nr7 6 r7 nr7 7 r8 nr8 7 r8 nr8 9 r9 nr9 9 r9 nr9 self left 1 l1 1 1 l1 1 2 l2 2 2 l2 2 2 l2 2 2 l3 3 2 l3 3 2 l2 2 2 l3 3 2 l3 3 3 l4 4 3 l4 4 4 l5 \N 4 l5 \N 4 l5 \N 4 l6 \N 4 l6 \N 4 l5 \N 4 l6 \N 4 l6 \N 5 l7 \N 5 l7 \N 8 l8 \N 8 l8 \N 9 l9 \N 9 l9 \N self left nullable 1 l1 1 1 l1 1 2 l2 2 2 l2 2 2 l3 3 2 l3 3 3 l4 4 3 l4 4 4 l5 \N 0 \N 4 l6 \N 0 \N 5 l7 \N 0 \N 8 l8 \N 0 \N 9 l9 \N 0 \N self left nullable vs not nullable 1 l1 1 1 l1 1 2 l2 2 2 l2 2 2 l3 3 2 l2 2 3 l4 4 2 l3 3 4 l5 \N 3 l4 4 4 l6 \N 3 l4 4 5 l7 \N 0 0 8 l8 \N 0 0 9 l9 \N 0 0 self left nullable vs not nullable 2 1 r1 \N 0 1 r2 \N 0 2 r3 \N 0 3 r4 \N 0 3 r5 \N 0 4 r6 nr6 4 r6 nr6 6 r7 nr7 6 r7 nr7 7 r8 nr8 7 r8 nr8 9 r9 nr9 9 r9 nr9 self right 1 l1 1 1 l1 1 2 l2 2 2 l2 2 2 l2 2 2 l3 3 2 l3 3 2 l2 2 2 l3 3 2 l3 3 3 l4 4 3 l4 4 4 l5 \N 4 l5 \N 4 l5 \N 4 l6 \N 4 l6 \N 4 l5 \N 4 l6 \N 4 l6 \N 5 l7 \N 5 l7 \N 8 l8 \N 8 l8 \N 9 l9 \N 9 l9 \N self right nullable 1 l1 1 1 l1 1 2 l2 2 2 l2 2 2 l3 3 2 l3 3 3 l4 4 3 l4 4 self right nullable vs not nullable 1 l1 1 1 l1 1 2 l2 2 2 l2 2 2 l3 3 2 l2 2 3 l4 4 2 l3 3 4 l5 \N 3 l4 4 4 l6 \N 3 l4 4 self full 1 l1 1 1 l1 1 2 l2 2 2 l2 2 2 l2 2 2 l3 3 2 l3 3 2 l2 2 2 l3 3 2 l3 3 3 l4 4 3 l4 4 4 l5 \N 4 l5 \N 4 l5 \N 4 l6 \N 4 l6 \N 4 l5 \N 4 l6 \N 4 l6 \N 5 l7 \N 5 l7 \N 8 l8 \N 8 l8 \N 9 l9 \N 9 l9 \N self full nullable 1 l1 1 1 l1 1 2 l2 2 2 l2 2 2 l3 3 2 l3 3 3 l4 4 3 l4 4 4 l5 \N 0 \N 4 l6 \N 0 \N 5 l7 \N 0 \N 8 l8 \N 0 \N 9 l9 \N 0 \N self full nullable vs not nullable 1 l1 1 1 l1 1 2 l2 2 2 l2 2 2 l3 3 2 l2 2 3 l4 4 2 l3 3 4 l5 \N 3 l4 4 4 l6 \N 3 l4 4 5 l7 \N 0 0 8 l8 \N 0 0 9 l9 \N 0 0