The -02 auxiliaries are applicable throughout the main tables. The -02 auxiliaries are not to be used independently, or cited first in a compound notation. They are always suffixed to a main number or notation which expresses the subject to be qualified. Since there is some repetition of terms between the various auxiliary tables, care should be taken in selecting the appropriate application e.g. to distinguish between audio-visual as a property (audio-visual training methods classified as 37.02-028.26) and as a form (a training video classified as 37.02(086.8) )