[]
[AddGroup({"tag": "p"}, [AddSkip(10)]), AddGroup({"tag": "p"}, [AddSkip(10)])]

[]
[AddSkip(5), AddGroup({"tag": "b"}, [AddSkip(10)])]

[]
[AddGroup({"tag": "p"}, [AddSkip(5), AddGroup({"tag": "b"}, [AddSkip(5)])]), AddGroup({"tag": "p"}, [AddGroup({"tag": "b"}, [AddSkip(5)]), AddSkip(5)])]