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xxxxxx      rxxxxx
xxxx        rrrxxx
xxxr       s rrrxx
xxx     sssss rrxx
xxr        s     x
xxr        sf    x
xxrr      fs     x
xxrr      p      x
xxsss            x
xxs              x
xxs             fx
xxx   sssf  rr  xx
xxx m  ssss rr  xx
xxxx   s s  rrrxxx
xxxxxxrr    rxxxxx
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