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xxxxxx  rrrrrxxxxx
xxxxrr  rrrr   xxx
xxx      rrrm  rxx
xxx            rxx
xx             rrx
xx   rrr p     rrx
xx   rrr         x
xx               x
xx          m    x
xx           m   x
xxrr             x
xxxrr         m xx
xxxrr           xx
xxxxr          xxx
xxxxxx       xxxxx
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