def _fracture_right(self, i):
self, left, right = ComplexBeamSpanner._fracture_right(self, i)
weights = [left.get_duration(), right.get_duration()]
assert sum(self.durations) == sum(weights)
split_durations = sequencetools.split_sequence_by_weights(
self.durations, weights, cyclic=False, overhang=False)
left_durations, right_durations = split_durations
left._durations = left_durations
right._durations = right_durations
return self, left, right
