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xxxx    rrrr   xxx
xxx      rrr    xx
xxx          f  xx
xx               x
xx    rr    h    x
xx   rrr         x
xx  rrr  p rr    x
xxrrrr     rrrr  x
xxrrrh      rrr  x
xxrr    h    rrrrx
xxx    rr     rrxx
xxx    rrr     rxx
xxxx    rrr    xxx
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