An Excel $$ file on your computer is called an Excel "workbook." Each workbook can consist of multiple "worksheets" $($these are the tabs that one can create; by default they are named Sheet$1,$ Sheet$2,$ and so on$...).$ This idea of an organizational hierarchy with an all encompassing

object $($i$.$e$.,$ the workbook$)$ containing a collection of other objects that are a step down in the organizational hierarchy is analogous to how we organize text data for text analytics. In particular, the "workbook" is analogous to $q,,$ and the "worksheet $"$is analogous to $q,$

"the corpus"; "documents"

"the corpus"; $"$NLP$"$

"the document"; "corpa" $($the plural of corpus$)$

$"$NLP$"$; "corpa" $($the plural of corpus$)$