computer software, instruction manuals, audio cassettes, video discs, compact disk-based materials comprising software and digitized video and audio discs, CD-ROMs, and multimedia discs, sold as a unit for interactive education in the fields of history and social science

'audio':5,20 'base':12 'cassett':6 'cd':23 'cd-rom':22 'compact':9 'compris':14 'comput':1 'digit':17 'disc':8,21,27 'disk':11 'disk-bas':10 'educ':34 'field':37 'histori':39 'instruct':3 'interact':33 'manual':4 'materi':13 'multimedia':26 'rom':24 'scienc':42 'social':41 'softwar':2,15 'sold':28 'unit':31 'video':7,18

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