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This discussion on Reddit may shed some light on the question raised above.
- https://www.reddit.com/r/linguistics/comments/45szna/the_suffix_ed_in_american_english_can_be/
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The current IPA key used in the English Wikipedia writes this reduced vowel that can be either [ɪ] or [ə] in shorthand as /ᵻ/ following the Oxford English Dictionary (e.g. needed /ˈniːdᵻd/, rested /ˈrɛstᵻd/).
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There are some words where you would use /ᵻd/ for -ed even after consonants that are not /d/ or /t/, especially adjectives such as rugged /ˈrʌɡᵻd/ or naked /ˈneɪkᵻd/. In American English, [ə] tends to be higher and more like [ɪ] when it's next to /ɡ/ or /k/ (witness the eye-dialect spelling 'Linkin' for Lincoln), so in reality it would be difficult to decide if you're actually hearing [ˈrʌɡɪd] and [ˈneɪkɪd] or [ˈrʌɡəd] and [ˈneɪkəd] for these examples.
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