1
45
20
-1
white
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]                                    ____   [
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]             |                    )   ___ |[
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=             |                    )  |   ||[
              |                   (   |   ||[
              |                    )  |___||[
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=   __        |                   (   |   ||[
]  /  \       |                    )  |___||[
] /____\      |___________________(________|[
]   ||         \____________________ ____ __[
]   ||                              |    |\ [
]   ||                              |____|  [
]  /__\                              \   \  [
+===================|   |===================+