0000000  45	uint64_t (little endian) with byte offset to root node
0000001   0
0000002   0
0000003   0
0000004   0
0000005   0
0000006   0
0000007   0

0000008  27	node 'dog' self_freq
0000009   0	node 'dog' children_freq

0000010 129	node 'door' self_freq, value 1 = (129 & 127)
0000011   1	node 'door' self_freq, value 128 = (1 << 7)
0000012   0	node 'door' children_freq

0000013   0	node 'doo' self_freq
0000014 129	node 'doo' children_freq, value 1 = (129 & 127)
0000015   1	node 'doo' children_freq, value 128 = (1 << 7)
0000016   2		index size (bytes)
0000017 114		key 'r'
0000018   3		byte offset to 'door' from beginning of 'doo'

0000019  12	node 'do' self_freq
0000020 156	node 'do' children_freq, value 28 = (156 & 127)
0000021   1	node 'do' children_freq, value 128 = (1 << 7)
0000022   4		index size (bytes)
0000023 103		key 'g'
0000024  11		byte offset to 'dog' from beginning of 'do'
0000025 111		key 'o'
0000026   6		byte offset to 'doo' from beginning of 'do'

0000027   0	node 'd' self_freq
0000028 168	node 'd' children_freq, value 40 = (168 & 127)
0000029   1	node 'd' children_freq, value 128 = (1 << 7)
0000030   2		index size (bytes)
0000031 111		key 'o'
0000032   8		byte offset to 'do' from beginning of 'd'

0000033   9	node 'eat' self_freq
0000034   0	node 'eat' children_freq

0000035   0	node 'ea' self_freq
0000036   9	node 'ea' children_freq
0000037   2		index size (bytes)
0000038 116		key 't'
0000039   2		byte offset to 'eat' from beginning of 'ea'

0000040   0	node 'e' self_freq
0000041   9	node 'e' children_freq
0000042   2		index size (bytes)
0000043  97		key 'a'
0000044   5		byte offset to 'ea' from beginning of 'e'

0000045   0	node '' self_freq
0000046 177	node '' children_freq, value 49 = (177 & 128)
0000047   1	node '' children_freq, value 128 = (1 << 7)
0000048   4		index size (bytes)
0000049 100		key 'd'
0000050  18		byte offset to 'd' from beginning of ''
0000051 101		key 'e'
0000052   5		byte offset to 'e' from beginning of ''
0000053