Words to Describe subheadings

How subheadings often is described ("________ subheadings")

• third
• intermediate
• regular
• useful
• informative
• sub
• informal
• various
• many
• clear
• preceding
• several
• specific
• consistent
• relevant
• range
• geographical
• narrower
• additional
• suitable
• main
• subject
• minor
• appropriate
• italic
• indented
• corresponding
• suggested
• logical
• above
• marginal
• further
• respective
• thematic
• meaningful
• pertinent
• applicable
• indirect
• frequent
• helpful
• separate
• detailed
• convenient
• standardized
• digit
• related
• following
• possible
• geographic
• descriptive
• numerous
• topical
• alphabetical
• different
• copious
• subsequent
• bold
• major
• standard
• brief
• previous
• multiple
• isolated
• broad
• level