Pre-recorded digital audio compact discs and electronic memories featuring instruction in languages, musical instruments, and musical voice, for self-study, and printed instructional material for use with the foregoing, sold as a unit

'audio':5 'compact':6 'digit':4 'disc':7 'electron':9 'featur':11 'forego':32 'instruct':12,26 'instrument':16 'languag':14 'materi':27 'memori':10 'music':15,18 'pre':2 'pre-record':1 'print':25 'record':3 'self':22 'self-studi':21 'sold':33 'studi':23 'unit':36 'use':29 'voic':19

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