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xxxxxx   rrrrxxxxx
xxxx     rrrr  xxx
xxx      rrr   rxx
xxx      rr    rxx
xx             rrx
xx       p  f  rrx
xx   rrr         x
xx   rrr         x
xx               x
xxr         f    x
xxrr             x
xxxr    rr      xx
xxxr    rr      xx
xxxx    rr     xxx
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