This is a test file with some referenced equations, line
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$$ this $$ $$(1)$$
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Some equations might be inside of text,
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$$ for example $$ $$(2)$$
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this one.
Some equations might be on start of paragraphs:
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$$ start $$ $$(3)$$
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of paragraph.
Other might be on separate paragraphs of their own:
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$$ separate $$ $$(4)$$
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Some of those can be labelled:
This is a test file with some referenced equations, line
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$$ this $$ $$(5)$$
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Some equations might be inside of text,
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$$ for example $$ $$(6)$$
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this one.
Some equations might be on start of paragraphs:
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$$ start $$ $$(7)$$
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of paragraph.
Other might be on separate paragraphs of their own:
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$$ separate $$ $$(8)$$
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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