computer software, audio cassettes, video discs, video tapes, compact disc-based materials comprising software and digitized video and audio discs, CD-Roms, and multimedia discs, along with instructional manuals and other printed instructional materials, all sold as a unit, for education in the fields of history, mathematics, and science

'along':28 'audio':3,20 'base':12 'cassett':4 'cd':23 'cd-rom':22 'compact':9 'compris':14 'comput':1 'digit':17 'disc':6,11,21,27 'disc-bas':10 'educ':43 'field':46 'histori':48 'instruct':30,35 'manual':31 'materi':13,36 'mathemat':49 'multimedia':26 'print':34 'rom':24 'scienc':51 'softwar':2,15 'sold':38 'tape':8 'unit':41 'video':5,7,18

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