twitch
For the past decade Stephen Hawking has used a voluntary twitch of his cheek muscle to compose words and sentences one letter at a time.
voluntary
For the past decade Stephen Hawking has used a voluntary twitch of his cheek muscle to compose words and sentences one letter at a time.
compose
For the past decade Stephen Hawking has used a voluntary twitch of his cheek muscle to compose words and sentences one letter at a time.
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