MMBN RNG carryover glitch

MMBN RNG carryover glitch

On two successive RNG calls, the second rng.next(x) preserves lower ffs(x) bits from previous result or is a known value.
ffs(x) = find first set; index of lowest bit set to 1

Affected:
- MMBN4 (battle selection, GMD contents)
- MMBN5 (GMD contents, more?)

Not known to be affected:
- MMBN6 (successive RNG calls usually flush leftover bits first)

00-01 -> 00-0F: skews
	00		-> 0, 2, 3, 3, 4, 6, 7, 7, 8, A, B, B, C, E, F, F
	01		-> 0, 1, 1, 2, 4, 5, 5, 6, 8, 9, 9, A, C, D, D, E

00-7F -> 00-FF: partitions in 4
	00-1F	-> A5, C0-E4, E6-FF
	20-3F	-> 65, 80-A4, A6-BF
	40-5F	-> 25, 40-64, 66-7F
	60-7F	-> E5, 00-24, 26-3F

00-7F -> 00-7F: partitions into 2
	00-1F	-> 25, 40-64, 66-7F
	20-3F	-> 65, 00-24, 26-3F
	40-5F	-> 25, 40-64, 66-7F
	60-7F	-> 65, 00-24, 26-3F

00-3F -> 00-FF: partitions into 2
	00-1F	-> 25, A5, 40-64, 66-7F, C0-E4, E6-FF
	20-3F	-> 65, E5, 00-24, 26-3F, 80-A4, A6-BF

Conversion table for 00-7F -> 00-FF:

	<< 1	 | 0,1	 + 1	 ^ E5
---------------------------------
00	-> 00	-> 00	-> 01	-> E4
			-> 01	-> 02	-> E7
01	-> 02	-> 02	-> 03	-> E6
			-> 03	-> 04	-> E1
02	-> 04	-> 04	-> 05	-> E0
			-> 05	-> 06	-> E3
03	-> 06	-> 06	-> 07	-> E2
			-> 07	-> 08	-> ED
04	-> 08	-> 08	-> 09	-> EC
			-> 09	-> 0A	-> EF
05	-> 0A	-> 0A	-> 0B	-> EE
			-> 0B	-> 0C	-> E9
06	-> 0C	-> 0C	-> 0D	-> E8
			-> 0D	-> 0E	-> EB
07	-> 0E	-> 0E	-> 0F	-> EA
			-> 0F	-> 10	-> F5
08	-> 10	-> 10	-> 11	-> F4
			-> 11	-> 12	-> F7
09	-> 12	-> 12	-> 13	-> F6
			-> 13	-> 14	-> F1
0A	-> 14	-> 14	-> 15	-> F0
			-> 15	-> 16	-> F3
0B	-> 16	-> 16	-> 17	-> F2
			-> 17	-> 18	-> FD
0C	-> 18	-> 18	-> 19	-> FC
			-> 19	-> 1A	-> FF
0D	-> 1A	-> 1A	-> 1B	-> FE
			-> 1B	-> 1C	-> F9
0E	-> 1C	-> 1C	-> 1D	-> F8
			-> 1D	-> 1E	-> FB
0F	-> 1E	-> 1E	-> 1F	-> FA
			-> 1F	-> 20	-> C5
10	-> 20	-> 20	-> 21	-> C4
			-> 21	-> 22	-> C7
11	-> 22	-> 22	-> 23	-> C6
			-> 23	-> 24	-> C1
12	-> 24	-> 24	-> 25	-> C0
			-> 25	-> 26	-> C3
13	-> 26	-> 26	-> 27	-> C2
			-> 27	-> 28	-> CD
14	-> 28	-> 28	-> 29	-> CC
			-> 29	-> 2A	-> CF
15	-> 2A	-> 2A	-> 2B	-> CE
			-> 2B	-> 2C	-> C9
16	-> 2C	-> 2C	-> 2D	-> C8
			-> 2D	-> 2E	-> CB
17	-> 2E	-> 2E	-> 2F	-> CA
			-> 2F	-> 30	-> D5
18	-> 30	-> 30	-> 31	-> D4
			-> 31	-> 32	-> D7
19	-> 32	-> 32	-> 33	-> D6
			-> 33	-> 34	-> D1
1A	-> 34	-> 34	-> 35	-> D0
			-> 35	-> 36	-> D3
1B	-> 36	-> 36	-> 37	-> D2
			-> 37	-> 38	-> DD
1C	-> 38	-> 38	-> 39	-> DC
			-> 39	-> 3A	-> DF
1D	-> 3A	-> 3A	-> 3B	-> DE
			-> 3B	-> 3C	-> D9
1E	-> 3C	-> 3C	-> 3D	-> D8
			-> 3D	-> 3E	-> DB
1F	-> 3E	-> 3E	-> 3F	-> DA
			-> 3F	-> 40	-> A5
---------------------------------
20	-> 40	-> 40	-> 41	-> A4
			-> 41	-> 42	-> A7
21	-> 42	-> 42	-> 43	-> A6
			-> 43	-> 44	-> A1
22	-> 44	-> 44	-> 45	-> A0
			-> 45	-> 46	-> A3
23	-> 46	-> 46	-> 47	-> A2
			-> 47	-> 48	-> AD
24	-> 48	-> 48	-> 49	-> AC
			-> 49	-> 4A	-> AF
25	-> 4A	-> 4A	-> 4B	-> AE
			-> 4B	-> 4C	-> A9
26	-> 4C	-> 4C	-> 4D	-> A8
			-> 4D	-> 4E	-> AB
27	-> 4E	-> 4E	-> 4F	-> AA
			-> 4F	-> 50	-> B5
28	-> 50	-> 50	-> 51	-> B4
			-> 51	-> 52	-> B7
29	-> 52	-> 52	-> 53	-> B6
			-> 53	-> 54	-> B1
2A	-> 54	-> 54	-> 55	-> B0
			-> 55	-> 56	-> B3
2B	-> 56	-> 56	-> 57	-> B2
			-> 57	-> 58	-> BD
2C	-> 58	-> 58	-> 59	-> BC
			-> 59	-> 5A	-> BF
2D	-> 5A	-> 5A	-> 5B	-> BE
			-> 5B	-> 5C	-> B9
2E	-> 5C	-> 5C	-> 5D	-> B8
			-> 5D	-> 5E	-> BB
2F	-> 5E	-> 5E	-> 5F	-> BA
			-> 5F	-> 60	-> 85
30	-> 60	-> 60	-> 61	-> 84
			-> 61	-> 62	-> 87
31	-> 62	-> 62	-> 63	-> 86
			-> 63	-> 64	-> 81
32	-> 64	-> 64	-> 65	-> 80
			-> 65	-> 66	-> 83
33	-> 66	-> 66	-> 67	-> 82
			-> 67	-> 68	-> 8D
34	-> 68	-> 68	-> 69	-> 8C
			-> 69	-> 6A	-> 8F
35	-> 6A	-> 6A	-> 6B	-> 8E
			-> 6B	-> 6C	-> 89
36	-> 6C	-> 6C	-> 6D	-> 88
			-> 6D	-> 6E	-> 8B
37	-> 6E	-> 6E	-> 6F	-> 8A
			-> 6F	-> 70	-> 95
38	-> 70	-> 70	-> 71	-> 94
			-> 71	-> 72	-> 97
39	-> 72	-> 72	-> 73	-> 96
			-> 73	-> 74	-> 91
3A	-> 74	-> 74	-> 75	-> 90
			-> 75	-> 76	-> 93
3B	-> 76	-> 76	-> 77	-> 92
			-> 77	-> 78	-> 9D
3C	-> 78	-> 78	-> 79	-> 9C
			-> 79	-> 7A	-> 9F
3D	-> 7A	-> 7A	-> 7B	-> 9E
			-> 7B	-> 7C	-> 99
3E	-> 7C	-> 7C	-> 7D	-> 98
			-> 7D	-> 7E	-> 9B
3F	-> 7E	-> 7E	-> 7F	-> 9A
			-> 7F	-> 80	-> 65
---------------------------------
40	-> 80	-> 80	-> 81	-> 64
			-> 81	-> 82	-> 67
41	-> 82	-> 82	-> 83	-> 66
			-> 83	-> 84	-> 61
42	-> 84	-> 84	-> 85	-> 60
			-> 85	-> 86	-> 63
43	-> 86	-> 86	-> 87	-> 62
			-> 87	-> 88	-> 6D
44	-> 88	-> 88	-> 89	-> 6C
			-> 89	-> 8A	-> 6F
45	-> 8A	-> 8A	-> 8B	-> 6E
			-> 8B	-> 8C	-> 69
46	-> 8C	-> 8C	-> 8D	-> 68
			-> 8D	-> 8E	-> 6B
47	-> 8E	-> 8E	-> 8F	-> 6A
			-> 8F	-> 90	-> 75
48	-> 90	-> 90	-> 91	-> 74
			-> 91	-> 92	-> 77
49	-> 92	-> 92	-> 93	-> 76
			-> 93	-> 94	-> 71
4A	-> 94	-> 94	-> 95	-> 70
			-> 95	-> 96	-> 73
4B	-> 96	-> 96	-> 97	-> 72
			-> 97	-> 98	-> 7D
4C	-> 98	-> 98	-> 99	-> 7C
			-> 99	-> 9A	-> 7F
4D	-> 9A	-> 9A	-> 9B	-> 7E
			-> 9B	-> 9C	-> 79
4E	-> 9C	-> 9C	-> 9D	-> 78
			-> 9D	-> 9E	-> 7B
4F	-> 9E	-> 9E	-> 9F	-> 7A
			-> 9F	-> A0	-> 45
50	-> A0	-> A0	-> A1	-> 44
			-> A1	-> A2	-> 47
51	-> A2	-> A2	-> A3	-> 46
			-> A3	-> A4	-> 41
52	-> A4	-> A4	-> A5	-> 40
			-> A5	-> A6	-> 43
53	-> A6	-> A6	-> A7	-> 42
			-> A7	-> A8	-> 4D
54	-> A8	-> A8	-> A9	-> 4C
			-> A9	-> AA	-> 4F
55	-> AA	-> AA	-> AB	-> 4E
			-> AB	-> AC	-> 49
56	-> AC	-> AC	-> AD	-> 48
			-> AD	-> AE	-> 4B
57	-> AE	-> AE	-> AF	-> 4A
			-> AF	-> B0	-> 55
58	-> B0	-> B0	-> B1	-> 54
			-> B1	-> B2	-> 57
59	-> B2	-> B2	-> B3	-> 56
			-> B3	-> B4	-> 51
5A	-> B4	-> B4	-> B5	-> 50
			-> B5	-> B6	-> 53
5B	-> B6	-> B6	-> B7	-> 52
			-> B7	-> B8	-> 5D
5C	-> B8	-> B8	-> B9	-> 5C
			-> B9	-> BA	-> 5F
5D	-> BA	-> BA	-> BB	-> 5E
			-> BB	-> BC	-> 59
5E	-> BC	-> BC	-> BD	-> 58
			-> BD	-> BE	-> 5B
5F	-> BE	-> BE	-> BF	-> 5A
			-> BF	-> C0	-> 25
---------------------------------
60	-> C0	-> C0	-> C1	-> 24
			-> C1	-> C2	-> 27
61	-> C2	-> C2	-> C3	-> 26
			-> C3	-> C4	-> 21
62	-> C4	-> C4	-> C5	-> 20
			-> C5	-> C6	-> 23
63	-> C6	-> C6	-> C7	-> 22
			-> C7	-> C8	-> 2D
64	-> C8	-> C8	-> C9	-> 2C
			-> C9	-> CA	-> 2F
65	-> CA	-> CA	-> CB	-> 2E
			-> CB	-> CC	-> 29
66	-> CC	-> CC	-> CD	-> 28
			-> CD	-> CE	-> 2B
67	-> CE	-> CE	-> CF	-> 2A
			-> CF	-> D0	-> 35
68	-> D0	-> D0	-> D1	-> 34
			-> D1	-> D2	-> 37
69	-> D2	-> D2	-> D3	-> 36
			-> D3	-> D4	-> 31
6A	-> D4	-> D4	-> D5	-> 30
			-> D5	-> D6	-> 33
6B	-> D6	-> D6	-> D7	-> 32
			-> D7	-> D8	-> 3D
6C	-> D8	-> D8	-> D9	-> 3C
			-> D9	-> DA	-> 3F
6D	-> DA	-> DA	-> DB	-> 3E
			-> DB	-> DC	-> 39
6E	-> DC	-> DC	-> DD	-> 38
			-> DD	-> DE	-> 3B
6F	-> DE	-> DE	-> DF	-> 3A
			-> DF	-> E0	-> 05
70	-> E0	-> E0	-> E1	-> 04
			-> E1	-> E2	-> 07
71	-> E2	-> E2	-> E3	-> 06
			-> E3	-> E4	-> 01
72	-> E4	-> E4	-> E5	-> 00
			-> E5	-> E6	-> 03
73	-> E6	-> E6	-> E7	-> 02
			-> E7	-> E8	-> 0D
74	-> E8	-> E8	-> E9	-> 0C
			-> E9	-> EA	-> 0F
75	-> EA	-> EA	-> EB	-> 0E
			-> EB	-> EC	-> 09
76	-> EC	-> EC	-> ED	-> 08
			-> ED	-> EE	-> 0B
77	-> EE	-> EE	-> EF	-> 0A
			-> EF	-> F0	-> 15
78	-> F0	-> F0	-> F1	-> 14
			-> F1	-> F2	-> 17
79	-> F2	-> F2	-> F3	-> 16
			-> F3	-> F4	-> 11
7A	-> F4	-> F4	-> F5	-> 10
			-> F5	-> F6	-> 13
7B	-> F6	-> F6	-> F7	-> 12
			-> F7	-> F8	-> 1D
7C	-> F8	-> F8	-> F9	-> 1C
			-> F9	-> FA	-> 1F
7D	-> FA	-> FA	-> FB	-> 1E
			-> FB	-> FC	-> 19
7E	-> FC	-> FC	-> FD	-> 18
			-> FD	-> FE	-> 1B
7F	-> FE	-> FE	-> FF	-> 1A
			-> FF	-> 00	-> E5
---------------------------------