I noticed this in many words e.g. puLP, the cluster /lp/ can take place in final position but not front.
e.g. 2. paRT but /rt/ can't take first place why?
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I won't go into details, but here's a brief account of how consonants are arranged in consonant clusters:
Every language has a unique set of rules called Phonotactic rules (or Phonotactic constraints) that govern the possible sequences of sounds in a particular language—that is, licit and illicit sequences of sounds. In other words, what sounds go together and where can they be found.
A sequence that is allowed in one language may be disfavoured in another language for instance, the cluster /pn/ is phonotactically well-formed in Greek, but ill-formed in English, that's why the /p/ in pneumonia is silent in English.
Over time, a language may undergo phonotactic change, for example, the /k/ in the word knight wasn't always silent as it is in Modern English, it was pronounced until Modern English.
Some of the constraints on syllable structure in ModEn are:
and many others....
There's a concept of Sonority, which is a relationship between sounds and how they are arranged within syllables.
A sonority hierarchy is a hierarchical ranking of speech sounds. A typical order of Sonority values is:
Vowels > Glides > Liquids > Nasals > Fricatives > Affricates > Plosives
It means that vowels are the most sonorous and plosives are the least sonorous sounds. Vowels ([ɑ æ i ɪ ɔ u] etc), glides ([j w]), liquids ([l ɹ]) and nasals ([m n ŋ]) are called sonorants, while the rest are called obstruents.
In phonology, we have a rule called Sonority Sequencing Principle which states that sounds rise in sonority from the onset (beginning of a syllable) to the nucleus and fall from the nuleus to the coda (end) of a syllable.
Here's a Sonority graph that illustrates how SSP works:
It's a sonority graph for 'trust' [tɹʌst]. Sonority should rise from the onset to the nucleus (usually a vowel) and then fall from the nucleus to the coda, which is indeed the case in [tɹʌst]:
The reason why certain clusters don't occur at the beginning of a syllable is because they violate the Phonotactics of English (Sonority Sequencing Principle).
The cluster /lp/ can occur at the end (coda) because it's concordant with the SSP; the Sonority falls from /l/ to /p/ (Sonority should fall in the coda).
However, it does not occur in the onset because the sonoriy falls from /l/ to /p/ rather than rising (Sonority should rise in the onset).
The cluster /pl/ occurs in the onset because the sonority rises now, but it doesn't occur in the coda because the Sonority rises and in the coda position, the Sonority should fall.
There are lots of other restrictions and exceptions like clusters with /s/, but I'm not going to discuss it further.