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w_1...........A...........2_w
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www_______________________www
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w_a___________a___________a_w
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w______ggggy_____ygggg______w
w______rrrry_____yrrrr______w
w______rrrry_____yrrrr______w
w______ggggy_____ygggg______w
w___________________________w
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w_b___________b___________b_w
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www_______________________www
w___________________________w
w_3-----------B-----------4_w
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