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xxxxxxr     rxxxxx
xxxxrrr     rrrxxx
xxx  rrr    h   xx
xxx h rrr       xx
xx  h  rrr       x
xx      rrrrf    x
xx      frrr     x
xx        p  ff  x
xx         h    fx
xx          f    x
xx   rrr         x
xxxrrrrr   rrrrrxx
xxxrrrr    rrrrrxx
xxxxrrh h  rrrrxxx
xxxxxx     rrxxxxx
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