If a line matches this pattern, then all the lines after it should be unindented once (until another rule matches).
If a line matches this pattern, then all the lines after it should be indented once (until another rule matches).
If a line matches this pattern, then only the next line after it should be indented once.
If a line matches this pattern, then its indentation should not be changed and it should not be evaluated against the other rules.
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Describes indentation rules for a language.