portable electronic microprocessor-based apparatus for teaching spelling, vocabulary, grammar, sentence structure, and other aspects of the English language and foreign languages, geography, history, art, science and business

'apparatus':6 'art':26 'aspect':16 'base':5 'busi':29 'electron':2 'english':19 'foreign':22 'geographi':24 'grammar':11 'histori':25 'languag':20,23 'microprocessor':4 'microprocessor-bas':3 'portabl':1 'scienc':27 'sentenc':12 'spell':9 'structur':13 'teach':8 'vocabulari':10

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