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how to arrange your friends in a form-factor of a binary tree, just so you can literally invert it for your birthday
![a flat disc, smoothed colored [red yellow green blue rose] radial-rays gradient, with a gray circle in the middle](https://dym.sh/fileserver/01NMEQ3XQFZ26HP4ZXP12HVBDV/attachment/original/016PZ11CP5YZV82MN3608C1YZE.png "a flat disc, smoothed colored [red yellow green blue rose] radial-rays gradient, with a gray circle in the middle")
how to arrange your friends in a form-factor of a binary tree, just so you can literally invert it for your birthday