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$_="abcdef";
s/@{[s".."."gr]}/$& /; print;

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```
s/@{[s".."."gr]}\K/ /;
```
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```
s/@{[s".."."gr]}\K/$"/;
```
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```
s".."."gr;
```
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```
@{[  ]}
```
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```
s/.../$& /;
```
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```
s/...\K/ /;
```
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```
s/...\K/$"/;
```