doc:   [
    DocGroup({"tag": "p"}, [
        DocChars(" xi"), DocGroup({"tag": "caret", "client": "left"}, []),
        DocChars("QY Cm4 66csQf")
    ]),
    DocGroup({"tag": "p"}, [
        DocGroup({"tag": "caret", "client": "right"}, []),
        DocChars("7K")
    ]),
    DocGroup({"tag": "p"}, [
        DocChars(" b"), DocGroup({"tag": "caret", "client": "middle"}, []),
        DocChars("8  EhHm0U 3  jt Yn8 ea7e  v1Mev56 LbKtq88 cQ  NsPW gr p 0  k65   JH P0O7ft50257uD  37m a Q5s5  k31CJ8M    X6Gt N4ro6 g0p0 5 ec1")
    ]),
    DocGroup({"tag": "bullet"}, [
        DocGroup({"tag": "p"}, [
            DocChars("QR7Vd01  lA 81 7 WOA fKe18F4 2a68 7 q xB 5u 0C7 Y V66  P cml6X   Flello world!XWhat\'s up with you?")
        ])
    ])
]

a_del: [
    DelGroup([
        DelSkip(3), DelGroup([]),
        DelSkip(13)
    ]),
    DelWithGroup([
        DelWithGroup([]),
        DelSkip(2)
    ]),
    DelWithGroup([
        DelSkip(1), DelChars(1)
    ])
]
a_add: [
    AddGroup({"tag": "p"}, [
        AddSkip(3)
    ]),
    AddGroup({"tag": "p"}, [
        AddSkip(1), AddChars("V"), AddGroup({"client": "left", "tag": "caret"}, []),
        AddSkip(12)
    ]),
    AddWithGroup([
        AddWithGroup([]),
        AddSkip(2)
    ]),
    AddWithGroup([
        AddSkip(1)
    ])
]

b_del: [
    DelGroup([
        DelSkip(3), DelWithGroup([]),
        DelSkip(13)
    ]),
    DelGroup([
        DelGroup([]),
        DelSkip(2)
    ])
]
b_add: [
    AddGroup({"tag": "bullet"}, [
        AddGroup({"tag": "p"}, [
            AddSkip(3), AddWithGroup([]),
            AddSkip(12), AddGroup({"tag": "caret", "client": "right"}, []),
            AddSkip(3)
        ])
    ])
]