This is a test file with some referenced equations, line
$$ this \qquad(1)$$
Some equations might be inside of text, $$ for example \qquad(2)$$ this
one.
Some equations might be on start of paragraphs:
$$ start \qquad(3)$$ of paragraph.
Other might be on separate paragraphs of their own:
$$ separate \qquad(4)$$
Some of those can be labelled:
This is a test file with some referenced equations, line
[$$ this \qquad(5)$$]{#eq:0}
Some equations might be inside of text,
[$$ for example \qquad(6)$$]{#eq:1} this one.
Some equations might be on start of paragraphs:
[$$ start \qquad(7)$$]{#eq:2} of paragraph.
Other might be on separate paragraphs of their own:
[$$ separate \qquad(8)$$]{#eq:3}
Then they can be referenced:
Individually eq. 5, eq. 6, eq. 7, eq. 8
Or in groups eqns. 5, 6, 8
Groups will be compacted eqns. 5-8