To recreate this with the sample data: buyer n/john p/87438807 e/alexyeoh@gmail.com
This could potentially arise in real life as real estate agents have a list of buyers to add, but misread which phone number / email belongs to who. Adding a duplication detection feature for these inputs might help catch these cases and warn them if such cases arise.

To recreate this with the sample data:
buyer n/john p/87438807 e/alexyeoh@gmail.comThis could potentially arise in real life as real estate agents have a list of buyers to add, but misread which phone number / email belongs to who. Adding a duplication detection feature for these inputs might help catch these cases and warn them if such cases arise.