Sentence:  It would authorize the Texas Education Agency to establish county-wide day schools for the deaf in counties of 300000 or more population , require deaf children between <WSD>6</WSD> and 13 years of age to attend the day schools , permitting older ones to attend the residential Texas School for the Deaf here . 
Meaning of the word marked with <WSD> tags:  denoting a quantity consisting of six items or units