Reference
Simple English Wikipedia
https://simple.wikipedia.org/wiki/Main_Page
Merriam-Webster's Learner's Dictionary
https://www.learnersdictionary.com/
Cambridge Learner's Dictionary
https://dictionary.cambridge.org/us/dictionary/learner-english/
Oxford Learner's Dictionary
http://www.oxfordlearnersdictionaries.com/us/
Merriam-Webster's Thesaurus
https://www.merriam-webster.com/thesaurus
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