Integer listSize is read from input, then listSize strings are read from input and stored in ArrayList passengersToPick. The recursive method listPassengers$()$ explores all unique orderings of two names picked from passengersToPick. In listPassengers$(),$ write the base case to output the following items if the size of ArrayList pickedPassengers is $2$:

"First: $"$

first element in pickedPassengers

$",$ Second: $"$

second element in pickedPassengers