
doc:   [
    DocGroup({"tag": "bullet"}, [
        DocGroup({"tag": "p"}, [
            DocGroup({"tag": "caret", "client": "a"}, []),
            DocChars(" ")
        ]),
        DocGroup({"tag": "p"}, [
            DocChars("6W MN"), DocGroup({"tag": "caret", "client": "b"}, []),
            DocChars("hM   43q SguYello Cgn DKt\'s up with you?")
        ])
    ])
]

a_del: [
    DelWithGroup([
        DelWithGroup([
            DelGroup([])
        ])
    ])
]
a_add: [
    AddWithGroup([
        AddWithGroup([
            AddChars("C"), AddGroup({"tag": "caret", "client": "a"}, [])
        ])
    ])
]

b_del: [
    DelGroup([
        DelWithGroup([
            DelWithGroup([]),
            DelSkip(1)
        ]),
        DelWithGroup([
            DelSkip(1), DelChars(4), DelGroup([])
        ])
    ])
]
b_add: [
    AddWithGroup([
        AddGroup({"tag": "caret", "client": "b"}, []),
        AddWithGroup([]),
        AddSkip(1)
    ]),
    AddWithGroup([
        AddSkip(1)
    ])
]
