The subdivisions of 811 can be derived from common auxiliaries of language =11/=9 (Table 1c) by substituting a point for the equals sign, e.g. 811.111 English language (as a subject of a linguistic study) derives from =111 English language. Denote phases using 81`01/`08 Special auxiliary numbers for origins and periods of languages. To denote details of linguistic studies use 81`1/`4 Special auxiliary numbers for subject fields and facets of linguistics