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xxxxxx     rrxxxxx
xxxx   f   rr  xxx
xxx   h         xx
xxx       h   f xx
xx               x
xx   h           x
xx   rrr p       x
xx   rrrr        x
xx   rrrr      h x
xx   rrrrm       x
xx   rrr h       x
xxx  rr      h  xx
xxx      h     rxx
xxxx   m     rrxxx
xxxxxx       xxxxx
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