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1. e =~ u
2. e =~ uae
3. e =~ edefe
4. e =~ ebe
5. e =~ ec

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```
e =~ u|uae|edefe|ebe|ec
```
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```
e =~ u(?:au)*
```
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```
e =~ udufu
```
Select or download this
```
e =~ ubu
```
Select or download this
```
e =~ uc
```