You are right, if you subtract the 184 "iii(i)" from the 4765 "ii" then you get exactly 4581. So everything is fine ( hooray ) 
So we have fulfilled Rene's requirements (same results from cryptool and python script, see post #45).
No. Bigram Frequency (in %) Frequency
1 CH 7.1390 11081
2 HE 5.3267 8268
3 DY 4.4789 6952
4 AI 4.3745 6790
5 OK 3.9809 6179
6 IN 3.8939 6044
7 OL 3.6298 5634
8 EE 3.4204 5309, 4889 + ( 413 x EEE + 7 x EEEE ) 420
9 QO 3.4126 5297
10 ED 3.2960 5116
11 II 3.0699 4765, 4581 + ( 183 x III + 1 x IIII ) 184
12 SH 2.9204 4533

So we have fulfilled Rene's requirements (same results from cryptool and python script, see post #45).
No. Bigram Frequency (in %) Frequency
1 CH 7.1390 11081
2 HE 5.3267 8268
3 DY 4.4789 6952
4 AI 4.3745 6790
5 OK 3.9809 6179
6 IN 3.8939 6044
7 OL 3.6298 5634
8 EE 3.4204 5309, 4889 + ( 413 x EEE + 7 x EEEE ) 420
9 QO 3.4126 5297
10 ED 3.2960 5116
11 II 3.0699 4765, 4581 + ( 183 x III + 1 x IIII ) 184
12 SH 2.9204 4533

