Stairs are interesting devices.
Manually operated, they can take you up or down to different levels. The are limited only by the energy available to the user operating it.
For example, some users store enough energy to go up twenty flights without problems.
Others can only go one or two without a recharge.
I think that’s why they invented the elevator, which is a scary thing to be stuck in if it runs out of power.
Enjoy today’s jigsaw puzzle!

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