Serialize prompts that cycle through choices

In some prompt templates, there is logic like this:
```
{% set seq = [

''Answer the question depending on the context.'',

''What is the answer?'',

] %}

{{ seq | choice }}

Context: {{context}};

Question: {{question}};

...
```
This makes it so that one prompt is effectively multiple prompts. We should "serialize" them into separate templates.