Membentuk choropleth dengan data geometri diperoleh dari GADM (https://gadm.org) dan data hidran didapat dari http://data.jakarta.go.id

Using `lag` and `lead` from `dplyr` library we can understand how to treat our data when it's possibe to have duplicated rows. Some knowledge about using `complete` from `tidyr` and the order of treating scrambled, full of missing rows is also written.