
doc:   [
    DocGroup({"tag": "bullet"}, [
        DocGroup({"tag": "p"}, [
            DocGroup({"client": "c", "tag": "caret"}, []),
            DocChars(" Mu6  "), DocGroup({"client": "b", "tag": "caret"}, []),
            DocChars("0")
        ]),
        DocGroup({"tag": "p"}, [
            DocChars(" ja "), DocGroup({"client": "d", "tag": "caret"}, []),
            DocChars("G4Hello world "), DocGroup({"client": "a", "tag": "caret"}, [])
        ])
    ]),
    DocGroup({"tag": "h1"}, [
        DocGroup({"tag": "caret", "client": "e"}, []),
        DocChars("Hc"), DocGroup({"tag": "caret", "client": "f"}, []),
        DocChars("hat\'s up with you?")
    ])
]

a_del: [
    DelGroup([
        DelWithGroup([
            DelWithGroup([]),
            DelSkip(2), DelChars(4), DelGroup([]),
            DelSkip(1)
        ]),
        DelWithGroup([
            DelSkip(4), DelWithGroup([]),
            DelSkip(14), DelGroup([])
        ])
    ]),
    DelWithGroup([])
]
a_add: [
    AddWithGroup([
        AddGroup({"client": "b", "tag": "caret"}, []),
        AddWithGroup([]),
        AddSkip(2), AddChars("E"), AddSkip(1)
    ]),
    AddWithGroup([
        AddSkip(4), AddWithGroup([]),
        AddSkip(14)
    ]),
    AddWithGroup([
        AddChars("A"), AddGroup({"tag": "caret", "client": "a"}, [])
    ])
]

b_del: [
    DelWithGroup([
        DelWithGroup([
            DelGroup([])
        ])
    ])
]
b_add: [
    AddWithGroup([
        AddWithGroup([
            AddChars(" "), AddGroup({"tag": "caret", "client": "c"}, [])
        ])
    ])
]
