def liftover(self, origin, dest, o_start, o_end, trim=False):
alig_cols = self.sequence_to_alignment_coords(origin, o_start,<EOL>o_end, trim=trim)<EOL>res = []<EOL>for s, e in alig_cols:<EOL><INDENT>t = self.alignment_to_sequence_coords(dest, s, e)<EOL>if t is None:<EOL><INDENT>continue<EOL><DEDENT>res.append(t)<EOL><DEDENT>return res<EOL>
liftover interval in one seq. of this pairwise alignment to the other.

        :param origin:  name of the origin seq (seq the input coordinates are for)
        :param dest:    name of the dest. seq (seq the result will be for)
        :param o_start: start of the interval (in sequence co-ordinates) to lift.
        :param o_end:   end of the interval (in seq. coords) to lift.