every anser is a | a | a | a | a |
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a
a
|
a
a
|
aa
a
|
a
a
|
a
a
|
a
a
|
a
a
|
a
a
|
a
a
|
a
a
|
a
a
|
a
a
|
a
a
|
a
a
|
a
a
|
a
a
|
a
a
|
aa
|
a
|
|
a
a
|
aa
a
|
a
a
|
a
a
|
a
a
|