a phonological word. In languages with a fixed stress, it is possible to ascertain word boundaries from its location. Although it is impossible to predict word boundaries from stress alone in languages with phonemic stress, there will be just one syllable with primary stress per word, which allows for determining the total number of words in an utterance. Many phonological rules operate only within a phonological word or specifically across word boundaries. In Hungarian, dental consonants /d/, /t/, /l/ or /n/ assimilate to a following semi-vowel /j/, yielding the corresponding palatal sound, but only within one word. Conversely, external sandhi rules act across word boundaries. The prototypical example of this rule comes from Sanskrit; however, initial consonant mutation in contemporary Celtic languages or the linking r phenomenon in some non-rhotic English dialects can also be used to illustrate word boundaries. It is often the case that a phonological word does not correspond to our intuitive conception of a word. The Finnish compound word pääkaupunki 'capital' is phonologically two words (pää 'head' and kaupunki 'city') because it does not conform to Finnish patterns of vowel harmony within words. Conversely, a single phonological word may be made up of more than one syntactical elements, such as in the English phrase I'll come, where I'll forms one phonological word. Lexemes A word can be thought of as an item in a speaker's internal lexicon; this is called a lexeme. Nevertheless, it is considered different from a word used in everyday speech, since it is assumed to also include inflected forms. Therefore, the lexeme refers to the singular teapot as well as the plural, teapots. There is also the question to what extent should inflected or compounded words be included in a lexeme, especially in agglutinative languages. For example, there is little doubt that in Turkish the lexeme for should include nominative singular ev or plural evler. However, it is not clear if it should also encompass the word evlerinizden 'from your houses', formed through regular suffixation. There are also lexemes such as "black and white" or "do-it-yourself", which, although consist of multiple words, still form a single collocation with a set meaning. Grammar Grammatical words are proposed to consist of a number of grammatical elements which occur together (not in separate places within a clause) in a fixed order and have a set meaning. However, there are exceptions to all of these criteria.