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docs: describe the Scottish English lexical sets in en.md.
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The English language support uses a vowel system based on John Wells' Lexical
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Sets<sup>\[<a href="#ref1">1</a>\]</sup>. These were created by Wells in 1982
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by comparing the Received Pronunciation British (RP) and General American
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(GenAm) accents in use at that time.
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(GenAm) accents in use at that time. The following accents are supported by
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eSpeak NG and are referenced in this document:
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The `en` transcriptions listed below are the phonemes used by eSpeak NG to
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transcribe the different lexical sets.
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| BCP47 | Abbreviation | Accent Name |
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|----------------|--------------|------------------------|
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| en | | British English |
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| en-029 | | Caribbean |
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| en-GB-scotland | ScE | Scottish English |
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| en-GB-x-gbclan | | Lancastrian |
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| en-GB-x-gbcwmd | | West Midlands |
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| en-GB-x-rp | RP | Received Pronunciation |
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| en-US | GenAm | General American |
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The BCP47 name is the standard language identifier for the accent, used as the
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espeak language name. The Abbreviation is used in the lexical set tables below
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for the IPA transcriptions of that accent, and the BCP47 names are used for the
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eSpeak NG phoneme names.
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## Short Vowels
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@@ -56,6 +69,14 @@ when considering the root form of the word containing that vowel.
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__NOTE:__ `/i@3/` is used for the NEAR lexical set to differentiate it from
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`/i@/` used in words like `million`.
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Additionally, espeak-ng has the following phonemes for different accents:
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| Lexical Set | en | en-GB-scotland | RP | ScE |
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|-------------|-------|----------------|-------|-------|
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| NURSE | `3:` | `VR` | ɜː | ʌɾ |
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| TERM | `3:` | `3:` | ɜː | ɛɾ |
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| BIRD | `3:` | `IR` | ɜː | ɪɾ |
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## Reduced Vowels
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These are unstressed vowels that differ from the vowels in the main lexical sets.
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@@ -111,3 +132,7 @@ merged with the other.
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1. <a name="ref1"></a> Wikipedia.
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[Lexical set](https://en.wikipedia.org/wiki/Lexical_set). 2017.
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Creative Commons Attribution-Sharealike 3.0 Unported License (CC-BY-SA).
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2. <a name="ref2"></a> Wikipedia.
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[IPA chart for English dialects](https://en.wikipedia.org/wiki/International_Phonetic_Alphabet_chart_for_English_dialects).
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2018. Creative Commons Attribution-Sharealike 3.0 Unported License (CC-BY-SA).
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