def arcs(self):
all_arcs = []<EOL>for l1, l2 in self.byte_parser._all_arcs():<EOL><INDENT>fl1 = self.first_line(l1)<EOL>fl2 = self.first_line(l2)<EOL>if fl1 != fl2:<EOL><INDENT>all_arcs.append((fl1, fl2))<EOL><DEDENT><DEDENT>return sorted(all_arcs)<EOL>
Get information about the arcs available in the code.

        Returns a sorted list of line number pairs.  Line numbers have been
        normalized to the first line of multiline statements.