Embedded Commands
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Most documents need more functionality beyond filling, adjusting and
implicit line breaking. In order to gain further functionality,
`gtroff' allows commands to be embedded into the text, in two ways.
The first is a "request" which takes up an entire line, and does
some large-scale operation (e.g. break lines, start new pages).
The other is an "escape" which can be embedded anywhere in the text,
or even as an argument to a request. Escapes generally do more minor
operations like sub- and superscripts, print a symbol, etc.