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EXAMPLES	NUCLEUS
CODA
	All the	p	p	-	-	-
	English	b	b	-	-	-
	vowel	t	t	t	t	-
	phonemes	d	d	d	-	-
	(20) may	k	k	-	-	-
	come in	g	-	-	-	-
	the	tƒ	tƒ	-	-	-
	position	dз	dз	-	-	-
	of nucleus	f	f	-	-	-
		v	v	-	-	-
		θ	θ	θ	θ	-
		ð	-	-	-	-
		s	s	s	s	s
		z	z	z	-	-
		ƒ	-	-	-	-
		з	-	-	-	-
		-	-	-	-	-
		l	-	-	-	-
		-	-	-	-	-
		-	-	-	-	-
		-	-	-	-	-
		m	m	-	-	-
		n	n	-	-	-
		ŋ	-	-	-	-

As it is seen from the table, in addition to three possible consonants in syllable-initial position, up to four consonants may be arranged after the vowel. This is in the so-called postvocalic position and, as we know, is referred to as the coda:

As with clusters in syllable-initial position, there are limitations on which consonants may combine and in what order in syllable-final position. Unlike syllable-initial clusters, however, it is not easy to represent all allowable combinations diagrammatically. Suffice it to say that there are at least 48 allowable three-consonant clusters and around seven allowable four-consonant clusters in syllable-final position in English. The following are some examples of syllable rimes.

As stated earlier, and demonstrated by the last example of texts above, consonants may occur in both prevocalic and postvocalic positions within the same syllable. Further examples include:

The above discussion demonstrates the basic syllable structure as consisting of an onset, a nucleus and a coda – with up to three consonants in the onset position, a vowel (or in some circumstances a syllabic consonant) as the nucleus, and up to four consonants acting as the coda.
Some linguists argue [13.55] that the term can only be properly applied to those consonant clusters that occur within one syllable. Others contend that the concept is more useful when it includes consonant sequences across syllable boundaries. According to the former definition, the longest consonant clusters in the word extra would be /ks/ and /tr/, whereas the latter allows /kstr/ or /kstʃr/ in some dialects.
Languages' phonotactics differ as to what consonant clusters they permit[Internet 40].
Many languages are more restrictive than English in terms of consonant clusters. Many languages forbid consonant clusters entirely. Hawaiian, like most Malayo-Polynesianlanguages, is of this sort. Japanese is almost as strict, but allows a sequence of a nasal plus another consonant, as in Honshū [honɕuː] (the name of the largest island). Standard Arabic forbids initial consonant clusters and more than two consecutive consonants in other positions. So do most other Semitic languages, although Modern Israeli Hebrew permits initial two-consonant clusters (e.g. pkak "cap"; dlaat "pumpkin"), and Moroccan Arabic allows strings of several consonants. Like most Mon–Khmer languages, Khmer permits only initial consonant clusters with up to three consonants in a row per syllable. 
Consonant clusters occurring in loanwords do not necessarily follow the cluster limits set by the borrowing language's phonotactics. In English, the longest possible initial cluster is three consonants, as in split /ˈsplɪt/ and strudel /ˈ[struːdəl/, all beginning with /s/ or /ʃ/ and ending with /l/ or /r/; the longest possible final cluster is five consonants, as in angsts /ˈæŋksts/ and in the Yorkshire place-name of Hampsthwaite /hæmpsθweɪt/, though that is rare and four, as in twelfths /ˈtwelfθs/, sixths /ˈsɪksθs/, bursts /ˈbə:rsts/ and glimpsed /ˈɡlɪmpst/, is more common. In compound words, longer clusters are possible, as in handspring /ˈhændspriŋ/.
It is important to distinguish clusters and digraphs. Clusters are made of two or more consonant sounds, while a digraph is a group of two consonant letters standing for a single sound. For example, in the word ship, the two letters of the digraph ⟨sh⟩ together represent the single consonant [ʃ]. Conversely, the letter ⟨x⟩ can produce the consonant clusters /ks/ (annex), /gz/ (exist), /kʃ/ (sexual), or /gʒ/ (some pronunciations of "luxury".).
Another problem is that different languages have different ways of dividing their sounds into vowels and consonants; for example, the usual sound produced at the beginning of the word ‘red’ is felt to be a consonant by most English speakers, but in some other languages (e.g. Mandarin Chinese) the same sound is treated as one of the vowels[Internet 43].
The words vowel and consonant are very familiar ones, but when we study the sounds of speech scientifically we find that it is not easy to define exactly what they mean. The most common view is that vowels are sounds in which there is no obstruction to the flow of air as it passes from the larynx to the lips. However, there are many cases where the decision is not so easy to make. One problem is that some English sounds that we think of as consonants, such as the sounds at the beginning of the words ‘hay’ and ‘way’, do not really obstruct the flow of air more than some vowels do.
If we say that the difference between vowels and consonants is a difference in the way that they are produced, there will inevitably be some cases of uncertainty or disagreement; this is a problem that cannot be avoided. It is possible to establish two distinct groups of sounds (vowels and consonants) in another way. Let’s take English words beginning with the sound h, what sounds can come next after this h? We find that most of the sounds we normally think of as vowels can follow (e.g. e in the word ‘hen’), but practically none of the sounds we class as consonants, with the possible exception of [ j ] in a word such as ‘huge’[hju:dƷ]. In English words beginning with the two sounds bi we find many cases where a consonant can follow (e.g. d in the word ‘bid’, or 1 in the word ‘bill’), but practically no cases where a vowel may follow. The problem is that we should define the different contexts and positions in which particular sounds can occur; this is the study of the distribution of the sounds, and is of great importance in phonology. Study of the sounds found at the beginning and end of English words has shown that two groups of sounds with quite different patterns of distribution can be identified, and these two groups are those of vowel and consonant[ 14.144-154]. If we look at the vowel—consonant distinction in this way, we must say that the most important difference between vowel and consonant is not the way that they are made, but their different distributions. It is important to remember that the distribution of vowels and consonants is different for each language.
This problem is closely connected with the combinations of sounds – vowels and consonants. Further we’ll try to define the nature of English consonant combinations, or clusters.
As we have already mentioned, consonants in languages may form combinations according to the rules of phonotactics of the same language. Existing consonant combinations or clusters in English are usually found in the beginning or end of words which coincide with syllable onsets and codas.
There are different types of biconsonant clusters in English and their distribution is regulated by a very simple algorithm proposed in above. Onset clusters occur word-initially and word-medially because they must be followed by a contentful vocalic position, which can govern and hence silence the empty vocalic position inside the cluster. Coda clusters are found word-medially and word-finally since these are the positions in which they can occur.
The second approach to the categorization of consonant clusters is based on the distribution of clusters[internet 44].
According to the distributional approach, onset clusters never occur at the end of words. Apparent final onset clusters contain a syllabic consonant, e.g., apple, circle. Furthermore, typical (falling sonority) coda clusters are never found word-initially. Word-medially, however, both rising and falling sonority clusters are attested, i.e. the word-medial site enjoys greater distributional freedom than the margins. What is even more interesting is that there are clusters that may occur only wordmedially, e.g., medley, motley, athlete, only, some of them occur as a result of syncope fam[i]ly.
These entities resemble onset clusters in as much as they display a rising sonority profile. Even those clusters that result from syncope almost all display a rising sonority profile and thus formally resemble clusters that occur only word-initially and word-medially. We may conclude that the simple onset cluster vs. coda cluster dichotomy is untenable.