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List of Abbreviations
| A2 | ASU index |
| ASU | analysis of speech unit |
| CR | coherence rating |
| ELT | English language teaching |
| IELTS | International English Language Testing System |
| ITA | international teaching assistant |
| L1 | first language |
| L2 | second language |
| NNS | non-native speaker |
| NS | native speaker |
| TESOL | Teaching English to Speakers of Other Languages |
| TR | turn rating |