{
  "seq": [
    [
      1,
      2,
      3
    ],
    [
      2,
      3,
      4
    ],
    [
      3,
      4,
      5
    ]
  ]
}
---
<ul>
{% for a, b in seq %}
  <li>{{ a }}: {{ b }}
{% endfor %}
</ul>
