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xxxxxx       xxxxx
xxxxrr       rrxxx
xxxrrrrr     rrrxx
xxxrrrrrr       xx
xxrrrrrrrr       x
xxrrr   rrrr f   x
xx m     rrr     x
xx        p    rrx
xx             rrx
xx              rx
xxrr            rx
xxxr        rr  xx
xxxr      rrrr  xx
xxxx     rrrrrrxxx
xxxxxx   rrrrxxxxx
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