 Complete the following phrase:  HarrisChan debuted internationally on the Challenger series at the 2019 CS Warsaw Cup, where they placed ninth, in the process defeating reigning Australian national champions KerryDodds in eleventh place by almost 25 points. They went on to win the Australian national title. HarrisChan made their ISU Championship debut at the 2020 Four Continents Championships in Seoul, where they placed ninth. They were assigned to compete at the 