Details of the Path Within State Transition Diagram for Left Descent to 27

The left descent assembly (descent to 27), ebsssbssbsbbssssbst, provides a rich example of an itinerary in the state diagram.  Every internal node (D through H) is visited, and some (D,F,H) travel to different neighbors on different occasions.
```l.d.a. elelement formula    state      step   eqn 2 application transition
________________________    _____      ____   _________________ __________

2^ 3 * 3^18 * n + 445  5[8],1[3]   b-step  (4*445-1)/3 = 593  A->D
2^ 5 * 3^17 * n + 593  1[8],2[3]   s-step  (2*593-1)/3 = 395  D->F
2^ 6 * 3^16 * n + 395  3[8],2[3]   s-step  (2*395-1)/3 = 263  F->H
2^ 7 * 3^15 * n + 263  7[8],2[3]   s-step  (2*263-1)/3 = 175  H->G
2^ 8 * 3^14 * n + 175  7[8],1[3]   b-step  (4*175-1)/3 = 233  G->D
2^10 * 3^13 * n + 233  1[8],2[3]   s-step  (2*233-1)/3 = 155  D->F
2^11 * 3^12 * n + 155  3[8],2[3]   s-step  (2*155-1)/3 = 103  F->G
2^12 * 3^11 * n + 103  7[8],1[3]   b-step  (4*103-1)/3 = 137  G->D
2^14 * 3^10 * n + 137  1[8],2[3]   s-step  (2*137-1)/3 =  91  D->E
2^15 * 3^ 9 * n +  91  3[8],1[3]   b-step  (4* 91-1)/3 = 121  E->C
2^17 * 3^ 8 * n + 121  1[8],1[3]   b-step  (4*121-1)/3 = 161  C->D
2^19 * 3^ 7 * n + 161  1[8],2[3]   s-step  (2*161-1)/3 = 107  D->F
2^20 * 3^ 6 * n + 107  3[8],2[3]   s-step  (2*107-1)/3 =  71  F->H
2^21 * 3^ 5 * n +  71  7[8],2[3]   s-step  (2* 71-1)/3 =  47  H->H
2^22 * 3^ 4 * n +  47  7[8],2[3]   s-step  (2* 47-1)/3 =  31  H->G
2^23 * 3^ 3 * n +  31  7[8],1[3]   b-step  (4* 31-1)/3 =  41  G->D
2^25 * 3^ 2 * n +  41  1[8],2[3]   s-step  (2* 41-1)/3 =  27  D->leaf
2^26 * 3^ 1 * n +  27       0[3]   leaf node ends the l.d.a.
```