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xxxxxx    f   rxxxxx
xxxxxf    f   rrxxxx
xxxxrf     f rrrrxxx
xxxrrrrrr   rrr   xx
xxrrrrrrr   rrrs   x
xx  rrrrr   rrsss  x
xx   rrr    sssss  x
xx       p  ssss   x
xx           ssss  x
xxrr     rr  ss    x
xxrr     rrr 2     x
xx        rrrf     x
xx        rrrr     x
xxx 2      srrrr  xx
xxxx     ssssrrrrxxx
xxxxx  h ssssssrxxxx
xxxxxx  sssssssxxxxx
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