In the easiest level, the patient completes phrases. This takes advantage of "automatic speech", speech that the patient is accustomed to hearing as a group.
S/he must select the correct word, to complete the phrase, from 4 choices. The next level would be word-typing. The user would type the correct word (in this case "down"). The intermediate level has the patient typing the word that completes the sentence. One of the higher levels is Definition Completion. Definition Completion 
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