He shared Yoshitada's love for "haikai no renga", a form of collaborative poetry composition. A sequence was opened with a verse in 5-7-5 mora format; this verse was named a "hokku", and would centuries later be renamed "haiku" when presented as a stand-alone work. The "hokku" would be followed by a related 7-7 mora verse by another poet. Both Bashō and Yoshitada gave themselves , or "haikai" pen names; Bashō's was , which was simply the "on'yomi" (Sino-Japanese reading) of his adult name, "." In 1662, the first extant poem by Bashō was published. In 1726, two of Bashō's hokku were printed in a compilation.