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①The elder always forgot to bring keys when they go out .
②It is hard for the elder to find keys in the bag,especially for the poor eyesight.
I designed a new crutch.With this crutch,the elder will never forget to bring keys.They can put their keys inside
the crutch.The key is installed in the front of the crutch handle, they just need to take the anterior rotation, they
can use it to open the door.