This one may be tough depending on how fatigued you are. Do as many clean intervals as you can. If your form starts to fall apart, cut it off there and note what you felt at that point.
Focus on clean controlled steps up in power.
Route of your choice. You are welcome to go longer on this ride if you like but please try to keep the effort level to ~85% of threshold. That would be just at the border between able to carry on a conversation and not.
This workout is intended to be challenging due to the lack of real rest. All the 'rest' intervals are still at a low Zone 3.