Braille - n. a system of writing for blind people in which letters are represented by raised dots

trial - n. a test of the quality, value, or usefulness of something

parallel - adj. moving in the same direction, side-by-side or taking place at the same time

hard of hearing - adj. relating to or having a defective but working sense of hearing

caption - n. a sentence or group of words that is written on or next to a picture to explain what is being shown
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