Test it like a player
Three of the five safety checks happen before start-up. Flipping those three opens the lock.
An unordered set: some switches up, the rest down. Good for checklists, fuse boxes and any 'which of these are true' question, because the order does not matter and the combination does.
Create a free lock →Switches
Flip switches 1, 3 and 5.
Flip the right switches
Three of the five safety checks happen before start-up. Flipping those three opens the lock.
Choose how many switches, then set the ones that should be on.