wrote
...that from around 900 to 1500 the Mixtec people wrote using pictorial representations and symbols?
...that from around <a href="./900" id="mwEFM" rel="mw:WikiLink" title="900">900</a> to <a href="./1500" id="mwEFQ" rel="mw:WikiLink" title="1500">1500</a> the <a href="./Mixtec" id="mwEFU" rel="mw:WikiLink" title="Mixtec">Mixtec</a> people <b id="mwEFY"><a href="./Mixtec_writing" id="mwEFc" rel="mw:WikiLink" title="Mixtec writing">wrote</a></b> using pictorial representations and symbols?