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Outline mode assumes that the lines in the buffer are of two types: heading lines and body lines.
A heading line represents a topic in the outline. Heading lines start with one or more asterisk (‘*’) characters; the number of asterisks determines the depth of the heading in the outline structure.
Any line that is not a heading line is a body line. Body lines belong with the preceding heading line.
A heading line together with all following body lines is called collectively an entry.
A heading line together with all following deeper heading lines and their body lines is called a subtree.