a |
|a| |
b |
|b| |
c |
|c| |
abc |
|abc| |
A.0 | B.1或-1 | C.2或-2 | D.0或-2 |
a |
|a| |
b |
|b| |
c |
|c| |
abc |
|abc| |
a |
|a| |
b |
|b| |
c |
|c| |
abc |
|abc| |
a |
|a| |
b |
|b| |
c |
|c| |
abc |
|abc| |
a |
|a| |
b |
|b| |
c |
|c| |
abc |
|abc| |
a |
|a| |
b |
|b| |
c |
|c| |
abc |
|abc| |
A.7 | B.-7 | C.0 | D.5 |
|
A.1 | B.2 | C.3 | D.4 |
|a| |
a |
b |
|b| |
|c| |
c |
abc |
|abc| |
y+2 |
x |
y |
A.1 | B.2009 | C.-1 | D.-2009 |
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