switch maintenance drugs

according to the definition of switch maintenence drug in rwToT_LoT_functions.py

def is_eligible_switch_maintenance(regimen, cases_maintenance, line_number):
regimen = [x.upper() for x in regimen]
cases_maintenance = pd.DataFrame(data = cases_maintenance)
cases_maintenance = cases_maintenance[cases_maintenance['maintenance_type'] == 'SWITCH']
return all(drug in regimen for drug in cases_maintenance['drug_name']) and (line_number == 1)

My understand to the above code is that to define it as a switch maintenance drug, all the switch maintenenance drugs in the cases_maintenance.csv must be in the regimen of the current line and the line number must be 1. If I understand it correctly, this function can never return True when there are more than one switch maintenance drug in cases_maintenance.csv.

Start in rwToT_LoT_functions.py at is_eligible_switch_maintenance and inspect the maintenance_type and drug_name values in cases_maintenance.csv. Verify whether all matching switch drugs are intended to be required for a line-1 regimen, and document or report the expected behavior when multiple switch maintenance drugs are present.