The substratal elements in Romanian are mostly lexical items. The process of determining if a word is of substratum involves comparison to Latin, languages Romanian came into contact, or determining if it is an internal construct, and if there are no matching results a comparison to Albanian vocabulary, Thracian remnants or Proto-Indo-European reconstructed words is made. In addition to vocabulary items, some other features of Eastern Romance, such as phonological features and elements of grammar (see Balkan sprachbund) may also be from Paleo-Balkan languages.