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xxxxxxm   rrrxxxxx
xxxxr     rr   xxx
xxx      rrr    xx
xxx     rrrr    xx
xx      rrrr     x
xx      rrrr     x
xx       rrr     x
xx       p       x
xx               x
xx   m           x
xx               x
xxx     rr  rr  xx
xxx    rrr  rr  xx
xxxx   rr   rrrxxx
xxxxxxrrr   rxxxxx
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