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![∃S[∅∈S∧∀x∈S((x∪{x})∈S)]](https://cdn2.scratch.mit.edu/get_image/project/1351713586_480x360.png)
![∃S[∅∈S∧∀x∈S((x∪{x})∈S)]](https://cdn2.scratch.mit.edu/get_image/project/1351712761_480x360.png)
![∃S[∅∈S∧∀x∈S((x∪{x})∈S)]](https://cdn2.scratch.mit.edu/get_image/project/1351515865_480x360.png)
