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xxxxxxxxxxxxxxxxxxxx
xxxxxx         xxxxx
xxxxx           xxxx
xxxx             xxx
xxx     f  hf     xx
xx                2x
xx   1             x
xx   rrrf          x
xx   rrrr  rr      x
xx    rrrp rrr     x
xx     rr   rr    rx
xx    f   h f    rrx
xxrrr           rrrx
xxrrr         f rrrx
xxxrr           rrxx
xxxxr           rxxx
xxxxx           xxxx
xxxxxx         xxxxx
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