.pg
.x do
.x break
.x end
.lt
------------------------------------------------------------------------
DO
  ...
  BREAK
  ...
END
------------------------------------------------------------------------
.el
.b 3
The DO macro is used to logically group a sequence of code together.
The DO is also used at the end of the CASE, FOR and WHILE macros.
.b
The BREAK macro will generate code to branch to the next instruction following
the END macro. The BREAK macro is optional. 
.b
For example:
.b
.lt
	do
		statement-1
		break
		statement-2
	end
.el
.b
will produce the following code:
.b
.lt
		statement-1
		brw	20001$
		statement-2
	20001$:
.el
.b
See also CASE, FOR, or WHILE.