an-1-an |
anan-1 |
an-an+1 |
anan+1 |
2n |
an |
1 |
an |
1 |
an-1 |
1 |
2 |
an-1-an |
anan-1 |
an-an+1 |
anan+1 |
an-1-an |
anan-1 |
an-1-an |
anan-1 |
1 |
an |
1 |
an-1 |
a1-a2 |
a2a1 |
1 |
2 |
1 |
an |
1 |
an-1 |
1 |
2 |
1 |
an |
1 |
2 |
1 |
2 |
1 |
an |
n |
2 |
2n |
an |
1-2n |
1-2 |
bn |
an |
S8 |
S5 |
A.1 | B.2 | C.3 | D.4 |
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