PRE-RECORDED AUDIO CASSETTE TAPES, DIGITAL VIDEO DISCS, LASER DISCS OR COMPACT DISCS FEATURING INSTRUCTION IN MATHEMATICS, BIOLOGY, CHEMISTRY, PHYSICS, HISTORY, SOCIAL STUDIES, READING, WRITING, GRAMMAR AND SPELLING; EDUCATIONAL COMPUTER SOFTWARE FEATURING INSTRUCTION IN MATHEMATICS, BIOLOGY, CHEMISTRY, PHYSICS, HISTORY, SOCIAL STUDIES, READING, WRITING, GRAMMAR AND SPELLING

'audio':4 'biolog':19,37 'cassett':5 'chemistri':20,38 'compact':13 'comput':31 'digit':7 'disc':9,11,14 'educ':30 'featur':15,33 'grammar':27,45 'histori':22,40 'instruct':16,34 'laser':10 'mathemat':18,36 'physic':21,39 'pre':2 'pre-record':1 'read':25,43 'record':3 'social':23,41 'softwar':32 'spell':29,47 'studi':24,42 'tape':6 'video':8 'write':26,44

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