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xxxxxxrrrrrrrxxxxx
xxxx    rrrrr  xxx
xxxr f m rrr  mfxx
xxx             xx
xx            f rx
xx        m  mrrrx
xx       p f rrrrx
xx      rrrrrrrrrx
xxr     rrrrrrrrrx
xxrr    rrrrrrrrrx
xxrr         rrrrx
xxxr            xx
xxxr      f     xx
xxxx           xxx
xxxxxx       xxxxx
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