Similar Patient matching algorithm is too loose

Currently in the registration flow, if the user attempts to register a patient similar one that is already registered, the system alerts the user and lists these patients.

The matching algorithm used to determine these patients is too loose. For example, it seems to be bringing up any patient with first name starting with the same 3 letters as the entered first name. Just for reference, at Mirebalais Hospital in Haiti, there are over 4000 patients with a first name starting with "Jean".

This algorithm should be reviewed and approved.

FYI - a similar issue is raised in ticket RA-70 for the exact patient algorithm