It seems you're combining a string with a conditional expression in programming. Here's how it might look when you try to concatenate the string "a" with the conditional expression `(a:b)` in a programming language like Python:

```python
a = "a"
result = a + (a if a else b)
```
The output will depend on the value of `a`:
- If `a` is truthy, `result` will be `"aa"`.
- If `a` is falsy (like `0`, `''`, `None`, `False`, or an empty list/dictionary), `result` will be `"b"`.
Remember that the expression `(a if a else b)` is evaluating the truthiness of `a` to decide which value to use in the concatenation. If you're using this in another context, please provide more details so I can give you the most accurate information.
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