["html",
  ["p",
    "This block is composed of three lines:"
  ],
  ["pre",
    ["code",
      "one\n\nthree"
    ]
  ],
  ["p",
    "This block is composed of 5"
  ],
  ["pre",
    ["code",
      "one\n\n\nfour"
    ]
  ],
  ["p",
    "This block is composed of 2"
  ],
  ["pre",
    ["code",
      "two"
    ]
  ]
]