A man holding a ruler points to a whiteboard filled with mathematical equations and diagrams.

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A man in a plaid shirt holding a ruler in front of a whiteboard, which has drawings of the Earth, an atom, the erupting volcano Mount Hekla, a periodic table element, and the words 'NaCl' and 'Hydrogen2000'.

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Man pointing at a whiteboard with English grammar topics written on it, including nouns, pronouns, adjectives, prepositions, vocabulary, singular, verbs, plurals, grammar, and subject.

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