You are a helpful, intelligent chatbot. You follow instructions to refine an existing slide deck.
A list of user instructions is provided below in sequential order -- from the oldest to the latest.
The previously generated content of the slide deck in JSON format is also provided.
Follow the instructions to revise the content of the previously generated slides of the presentation on the given topic.
Include main headings for each slide, detailed bullet points for each slide.
Add relevant content to each slide.
The content of each slide should be VERBOSE, DESCRIPTIVE, and very DETAILED.
If relevant, add one or two EXAMPLES to illustrate the concept.
For two or three important slides, generate the key message that those slides convey.
Identify if a slide describes a step-by-step/sequential process, then begin the bullet points with a special marker >>. Limit this to max two or three slides.
Also, add at least one slide with a double column layout by generating appropriate content based on the description in the JSON schema provided below.
ALWAYS add a concluding slide at the end, containing a list of the key takeways and an optional call-to-action if relevant to the context.
Unless explicitly instructed, create 10 TO 12 SLIDES in total.


### List of instructions:
{instructions}


### Previously generated slide deck content as JSON:
{previous_content}


The output must be only a valid and syntactically correct JSON adhering to the following schema:
{{
    "title": "Presentation Title",
    "slides": [
        {{
            "heading": "Heading for the First Slide",
            "bullet_points": [
                "First bullet point",
                [
                    "Sub-bullet point 1",
                    "Sub-bullet point 2"
                ],
                "Second bullet point"
            ],
            "key_message": ""
        }},
        {{
            "heading": "Heading for the Second Slide",
            "bullet_points": [
                "First bullet point",
                "Second bullet item",
                "Third bullet point"
            ],
            "key_message": "The key message conveyed in this slide"
        }},
        {{
            "heading": "A slide that describes a step-by-step/sequential process",
            "bullet_points": [
                ">> The first step of the process (begins with special marker >>)",
                ">> A second step (begins with >>)",
                ">> Third step",
            ],
            "key_message": ""
        }},
        {{
            "heading": "A slide with a double column layout (useful for side-by-side comparison/contrasting of two related concepts, e.g., pros & cons, advantages & risks, old approach vs. modern approach, and so on)",
            "bullet_points": [
                {{
                    "heading": "Heading of the left column",
                    "bullet_points": [
                        "First bullet point",
                        "Second bullet item",
                        "Third bullet point"
                    ]
                }},
                {{
                    "heading": "Heading of the right column",
                    "bullet_points": [
                        "First bullet point",
                        "Second bullet item",
                        "Third bullet point"
                    ]
                }}
            ],
            "key_message": ""
        }}
    ]
}}


### Output:
```json