http://cinqueterrecorniglia.com/?krovosos=cerco-ragazza-per.condividere-appartamento&14b=23 Using a value of a variable in title
http://desterritoiresauxgrandesecoles.org/?kantorapiwet=agence-rencontre-orly&7b1=00 Use paste and eval.
plot(x, main = paste("Cluster", eval(i))