"0","```r
#uncomment the following line if you haven't installed these packages yet
#install.packages(c('vegan', 'cluster', 'rioja', 'gplots', 'adjclust)) 

library('vegan')
library('cluster')
library('rioja')
library('gplots')
library('adjclust')

# also uses stats package, included with base R.
```"
