["html", ["p", "This block is composed of three lines:"],
    ["pre", ["code", "one\u000a\u000athree"]],
    ["p", "This block is composed of 5"],
    ["pre", ["code", "one\u000a\u000a\u000afour"]],
    ["p", "This block is composed of 2"],
    ["pre", ["code", "two"]]]