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That's the original sequence:
⬅↕➡,⬅↕,➡,⬅,?,?,↕➡
I'm going to use other symbols to make it readable:
(/), (/,), (/, ?, ?, /)
I've noticed that the comma initally moves to the left,in fact we have a full symbol ⬅↕➡ that gets cut by the comma and becomes ⬅↕, and then the other part, goes after t...