{
  "type": "root",
  "children": [
    {
      "type": "paragraph",
      "children": [
        {
          "type": "strong",
          "children": [
            {
              "type": "emphasis",
              "children": [
                {
                  "type": "underline",
                  "children": [{ "type": "text", "value": "bold italic underlined" }]
                },
                { "type": "text", "value": " bold italic" }
              ]
            },
            { "type": "text", "value": " bold" }
          ]
        },
        { "type": "text", "value": " plain" }
      ]
    }
  ]
}