This is your h1, it can drop to 2-3 lines but probably not longer.

Heading 2 style is for headlines down the page. There should only be one h1 per page.

H3 is nice for "eyebrows"

H4 is good for small but bold headings in, say, three-column sections or for subtitles

H5 if you need something a little larger than body copy but not so bold. Not really sure about this one...
H6 is nice for feature callouts in places where we want the text to be lighter, but larger

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