Inclusions (and exclusions) help by greatly simplifying general rules. They're not a mandatory part of an EDD, but without them, you'll spend much more time working out complex groups and occurrence indicators.
*Starting with FrameMaker 2020, I changed the element name in your exercises from TextRange to Term. Same element, just a different tag. Apologies for any confusion.
In other words, in exercises in the FrameMaker 2020 workbook you'll see the element name is Term, not TextRange.