Challange (noun) - Something difficult and interesting, Delete (verb) - To remove something for example from a computer file, Device (noun) - An object or machine for a specific purpose, Look at (phrasal verb) - To read something to form an opinion, Notice (verb) - To see and be aware of something, Period (noun) - A division of time, Restrict (verb) - To limit , Usage (noun) - A way that something is used, Substantial (adjective) - Large in size or importance, Shocking (adjective) - Extremely surprising and upsetting,

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