求教：stata数据处理的问题

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在stata 里面，我得到下面的数据，有很多数据是相同的，这些数据我只想取出一个来，有什么命令可以把这些不同的数据取出来，并排在一列里面，谢谢
1.94e+08
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设这列数据的变量是x

sort x

by x: gen n=_n

keep if n==1

drop n

共有16个不同的值：

1.940e+08
6.650e+08
1.230e+09
1.760e+09
2.460e+09
3.440e+09
4.080e+09
5.310e+09
8.100e+09
9.790e+09
1.170e+10
1.830e+10
2.760e+10
3.070e+10
3.490e+10
3.640e+10

谢谢

sort x
gen y=x[_n-1]
replace x=0 if y==x
sort x

duplicates drop