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xxxxxxr   rrr  xxxxx
xxxxxrr    rr f xxxx
xxxxrrrr         xxx
xxx   rr          xx
xxr                x
xxrr f             x
xxrrf f   p  rrr   x
xxr     rrrrrrrr   x
xx      rrrrrrr    x
xx      rrrrr      x
xx       rrr  m    x
xx      f      rr  x
xx            rrr  x
xxx     m    rrrrrxx
xxxx         rrrrxxx
xxxxxr         rxxxx
xxxxxx         xxxxx
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