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xxxxxx       xxxxx
xxxxr          xxx
xxxr   f     f  xx
xxx    f        xx
xxs          f   x
xx        rr     x
xx       rrr     x
xxrrr  prrr      x
xxrrr   rr       x
xxrrrf  rr sssf fx
xxr   f    s     x
xxx        f    xx
xxx  f f   s f  xx
xxxx       s   xxx
xxxxxxrr   ssxxxxx
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