Happiness seems to be about creating ProxSets and living with them.
Change seems to be about building new ProxSets, and adapting or changing existing ProxSets. Being happy with change would then be having this process for change in some of the ProxSets you live with.
Being consistently happy would seem to involve consistently having or creating ProxSets you can live with, and/or consistently changing your ProxSets so you can live with them.
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Proxri Deal: As you find our relationship rewarding, proxri with the proximity in mind.