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__|    |@1 @1|_ _ _ @| |1 2|2|
__|    |@2 @2|_ _ _ @| |1 2|2|
__|    |@3 @3|_ _ _ @| |1 2|2|
__|    | |@| | |1|
_|  |@ @ @_|_ _1 _2 _ @ @| |1 2|2|
_|  |_@ _@|_ _1 _2 _ _@| |1 2|2|
_|  |@ @ @_|_ _1 _2 _ @| |1 2|2|
_|  | |@| | |1|
___| |_@ _@|_ _ _1 _2 _@ _@_ _@_ _@_| |1 2|2|
___| | |_@ _@ _@_| | |1|
__|   |@ @|  @ @ @| |1 2|2|
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__|  |@ @|_ @| |1 2|2|
|. . |_@ _@|__ __ _@| |1 2 3 4|2 3|
|. . | |_@| | |1|
| |_@ _@|_@| |1 2|2|
| | |  | |1 2 3 4|2 3|
| |_@ _@|_@| |1 2 3 4|2 3|
| | |  | |1 2 3 4|2 3|
| |_@ _@|_@| |1 2 3 4|2 3|
_|       |@ | @ @ @| |1 2|2 3|
__|  | |  @_ @| |1 2|2|
__|  | |  @_ @| |1 2|2|
__| |@ @|@ @ @| |1 2|2|
__| |@ @|@ @ @| |1 2|2|
_| |@ @| @ @ @| |1 2 3 4|2 3|
__|   |@ @_ @_ @_ @_|@| |1 2|2|
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__| |@ @|  @ @| |1 2|2|
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| |_@ _@|_@| |1 2 3 4|2 3|
__17_18_|  17, 18  |@ @|@ @ @| |1 2 3 4|2 3|
__|  |@ @|@| |1 2|2|
_| |_ _ _ _ _|| |1 2 3 4|2 3|
_|  |@ @|_ @| |3 4|3|
___|  ||| |2|2|
