Moves for reducing Depth

We start with the expression

we enfold a bit of empty space

we create the letters a and c alongside the empty circle

we enfold another bit of empty space

we create letter b beside the empty circle

we copy c into depth 2, a into depth 4

we uncopy the expression (((a)b)c)

we copy c into depth 3

Finally, we uncopy the expression (ac)

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