'Return a list of sequence items on the page.
Sequence items are one level below subsections in the course nav.
Example return value:
[\'Chemical Bonds Video\', \'Practice Problems\', \'Homework\']'

@property
def sequence_items(self):

    seq_css = 'ol#sequence-list>li>.nav-item>.sequence-tooltip'
    return self.q(css=seq_css).map(self._clean_seq_titles).results
