def write_usage(self, prog, args='', prefix='Usage: '):
"""Writes a usage line into the buffer.
:param prog: the program name.
:param args: whitespace separated list of arguments.
:param prefix: the prefix for the first line.
"""
title = nodes.subtitle()
title.append(nodes.literal('', '{} {}'.format(self._topname, prog)))
usage = nodes.paragraph()
usage.append(nodes.Text(prefix))
usage.append(nodes.literal('', '{} {} {}'.format(self._topname, prog, args)))
self._node.append(title)
self._node.append(usage)
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