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The padlock is easy - have the housemate ride a bike and have them chain it up for security when they go somewhere. In this case you don't even need to mention the padlock - having the roommate be...
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#3: Attribution notice added
Source: https://writers.stackexchange.com/a/43511 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
The padlock is easy - have the housemate ride a bike and have them chain it up for security when they go somewhere. In this case you don't even need to mention the padlock - having the roommate be commute by bicycle will be enough to imply that they may have things like a bike chain, a padlock, a helmet, a tire pump, etc.