I have a matrix `U = vcat(s, e, p)`

of the form

```
3167×2 Matrix{Int64}:
1 1
1 1
1 1
1 1
1 2
1 2
1 2
1 3
1 3
1 3
3 2
3 2
3 3
⋮
962 5
962 5
962 5
962 5
962 5
1007 5
1009 5
1009 5
1009 5
1009 5
1009 5
1045 2
```

where `s`

, `e`

, `p`

are matrices of two columns themselves.

I want an equivalent of the `unique`

function but for the rows, so that I obtain a matrix `U'`

whose rows are the rows of `U`

but without any duplicates. How can this be done?