priority:10

ppppppp--------
ppppppp--------
ppppppp--------
ppppppp--------
ppppppp--------
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ppppppp--------
p-----p--------
p-----p--------
p-----p--------
pppp--p--------
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ppppppp--------
p-----p--------
p-----p--------
p-----p--------
pppp--p--------
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pp---pp--------
p-----p--------
p-----p--------
p-----p--------
p-pp--p--------
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ppppppp--------
p-----p--------
p-----p--------
p-----p--------
ppp------------
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