Master of intrigue, tell me, how did you open these three times?

>>>>>>

For a long time for convicted people living with children or the elderly, sold full of constipation, which can be opened from the outside. Per the simplest and most common design - the fixer, locking the door from the inside, on the outside looks like a head of a large screw (and it can be opened by checking it, for example, a five-ruble coin or a dull side of a kitchen knife).

Ask the vendors in the store, they will show and tell.