chunk.begin and chunk.end can be found from knit_patterns, so no need to provide them
chunk.begin and chunk.end can be found from knit_patterns, so no need to provide them

fboehm/cboettig_site,fboehm/labnotebook,fboehm/cboettig_site,fboehm/labnotebook,antass/labnotebook3,fboehm/labnotebook,fboehm/labnotebook,antass/labnotebook3,fboehm/cboettig_site,antass/labnotebook3,fboehm/cboettig_site,fboehm/cboettig_site,fboehm/labnotebook,fboehm/labnotebook