{% for item in demo1 -%}
  {% if item.type == "text" %}{{
      item.value 
  }}{% elsif item.type == "demo" %} \\
    \begin{tabular}{l{%for var in item.vars %}c{% endfor %}}
      {%for var in item.vars %} & @{{var}}@ {% endfor %} \\
{% for step in item.steps -%}
{%-if step.code -%}
\begin{lstlisting}
{% for line in step.code %}{{ line }}
{% endfor -%}
\end{lstlisting}
{%- endif -%}
      {% for var in item.vars -%}
        & {{ step.endvals[var] }}
      {%- endfor %} \\
    {% endfor -%}
    \end{tabular} \vspace{6pt} \\
  {% else %}
    BAD ITEM
  {% endif %}
{%- endfor -%}

{% for item in demo2 -%}
  {% if item.type == "text" %}{{
      item.value 
  }}{% elsif item.type == "demo" %} \\
    \begin{tabular}{l{%for var in item.vars %}c{% endfor %}}
      {%for var in item.vars %} & @{{var}}@ {% endfor %} \\
{% for step in item.steps -%}
{%-if step.code -%}
\begin{lstlisting}
{% for line in step.code %}{{ line }}
{% endfor -%}
\end{lstlisting}
{%- endif -%}
      {% for var in item.vars -%}
        & {{ step.endvals[var] }}
      {%- endfor %} \\
    {% endfor -%}
    \end{tabular} \vspace{6pt} \\
  {% else %}
    BAD ITEM
  {% endif %}
{%- endfor -%}