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xxxxxx       xxxxx
xxxx         rrxxx
xxxr         rrrxx
xxxrr  f f      xx
xxrrr          f x
xxrrr    prr     x
xx       rrr     x
xx     frrr     mx
xx  f  rrr       x
xx   rrrr        x
xx   rrr         x
xxx       f rr  xx
xxx         rr fxx
xxxxrr      rrrxxx
xxxxxx   m  rxxxxx
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