ブラウン・コーパスhttp://www.cs.gmu.edu/~sean/cs499/pmwiki.php/Main/DistributionOfDigraphFrequency をもとに、てれこまとめ（th+ht、er+reとしてまとめたもの。）かつ、同文字反復は省いた。

	同字抜	順+逆合計	比率	比率累計
1	er	143444	3.966%	3.97%
2	ht	140492	3.884%	7.85%
3	eh	124097	3.431%	11.28%
4	in	102192	2.825%	14.11%
5	it	84886	2.347%	16.45%
6	an	84336	2.332%	18.79%
7	en	79891	2.209%	20.99%
8	no	78666	2.175%	23.17%
9	es	77541	2.144%	25.31%
10	de	74395	2.057%	27.37%
11	or	73440	2.031%	29.40%
12	at	72441	2.003%	31.40%
13	ar	63298	1.750%	33.15%
14	is	61311	1.695%	34.85%
15	et	59236	1.638%	36.49%
16	fo	58010	1.604%	38.09%
17	ot	57045	1.577%	39.67%
18	al	55892	1.545%	41.21%
19	st	53208	1.471%	42.68%
20	el	52025	1.438%	44.12%
21	dn	50060	1.384%	45.51%
22	as	43806	1.211%	46.72%
23	em	43207	1.195%	47.91%
24	ev	40488	1.119%	49.03%
25	gn	40483	1.119%	50.15%
26	il	40375	1.116%	51.27%
27	ce	38562	1.066%	52.33%
28	ah	38062	1.052%	53.39%
29	ir	37024	1.024%	54.41%
30	ou	36912	1.021%	55.43%
31	nt	35861	0.992%	56.42%
32	ac	35547	0.983%	57.41%
33	co	33648	0.930%	58.34%
34	mo	33449	0.925%	59.26%
35	ci	33008	0.913%	60.17%
36	hi	32470	0.898%	61.07%
37	am	31463	0.870%	61.94%
38	di	29424	0.814%	62.75%
39	io	29001	0.802%	63.56%
40	lo	27979	0.774%	64.33%
41	rt	27618	0.764%	65.09%
42	ae	27514	0.761%	65.85%
43	su	27405	0.758%	66.61%
44	tu	25144	0.695%	67.31%
45	os	25030	0.692%	68.00%
46	im	24495	0.677%	68.68%
47	ep	23525	0.650%	69.33%
48	ru	23457	0.649%	69.98%
49	be	23225	0.642%	70.62%
50	ow	22772	0.630%	71.25%
51	ad	22294	0.616%	71.86%
52	ai	21916	0.606%	72.47%
53	ch	21881	0.605%	73.07%
54	aw	21364	0.591%	73.66%
55	ho	20624	0.570%	74.24%
56	op	20463	0.566%	74.80%
57	ei	19567	0.541%	75.34%
58	ew	19205	0.531%	75.87%
59	iv	18492	0.511%	76.38%
60	nu	18424	0.509%	76.89%
61	ap	18079	0.500%	77.39%
62	eg	18012	0.498%	77.89%
63	ly	17880	0.494%	78.39%
64	ns	17825	0.493%	78.88%
65	lu	17753	0.491%	79.37%
66	fi	17688	0.489%	79.86%
67	pr	16998	0.470%	80.33%
68	ct	15811	0.437%	80.77%
69	rs	15688	0.434%	81.20%
70	gi	15587	0.431%	81.63%
71	hw	15045	0.416%	82.05%
72	iw	15036	0.416%	82.46%
73	do	14944	0.413%	82.88%
74	ab	14353	0.397%	83.27%
75	ef	14152	0.391%	83.66%
76	cn	14082	0.389%	84.05%
77	hs	13986	0.387%	84.44%
78	ag	13380	0.370%	84.81%
79	dl	13210	0.365%	85.17%
80	av	12184	0.337%	85.51%
81	bo	11738	0.325%	85.84%
82	bu	11475	0.317%	86.15%
83	ek	11382	0.315%	86.47%
84	gr	11075	0.306%	86.77%
85	cu	10944	0.303%	87.08%
86	dr	10878	0.301%	87.38%
87	ey	10825	0.299%	87.68%
88	ay	10440	0.289%	87.97%
89	lp	10384	0.287%	88.25%
90	gh	10151	0.281%	88.53%
91	ov	9517	0.263%	88.80%
92	mu	9388	0.260%	89.06%
93	cr	9191	0.254%	89.31%
94	bl	9151	0.253%	89.56%
95	pu	9124	0.252%	89.82%
96	ry	9119	0.252%	90.07%
97	fr	9061	0.251%	90.32%
98	af	8995	0.249%	90.57%
99	ps	8879	0.245%	90.81%
100	go	8685	0.240%	91.05%
101	au	8635	0.239%	91.29%
102	mp	8427	0.233%	91.52%
103	ty	8418	0.233%	91.76%
104	ip	8337	0.231%	91.99%
105	lt	8296	0.229%	92.22%
106	gu	8289	0.229%	92.45%
107	du	7931	0.219%	92.67%
108	oy	7775	0.215%	92.88%
109	ex	7650	0.212%	93.09%
110	ls	7337	0.203%	93.29%
111	mr	7257	0.201%	93.50%
112	bi	6981	0.193%	93.69%
113	nr	6533	0.181%	93.87%
114	ik	6331	0.175%	94.04%
115	ck	6327	0.175%	94.22%
116	by	6144	0.170%	94.39%
117	cs	6069	0.168%	94.56%
118	ms	6049	0.167%	94.72%
119	cl	5902	0.163%	94.89%
120	eu	5759	0.159%	95.05%
121	br	5255	0.145%	95.19%
122	sy	5111	0.141%	95.33%
123	ak	5080	0.140%	95.47%
124	qu	5011	0.139%	95.61%
125	fl	4795	0.133%	95.74%
126	ds	4789	0.132%	95.88%
127	ny	4657	0.129%	96.01%
128	kn	4607	0.127%	96.13%
129	fu	4332	0.120%	96.25%
130	iu	4253	0.118%	96.37%
131	lr	4155	0.115%	96.48%
132	eo	4096	0.113%	96.60%
133	hr	4031	0.111%	96.71%
134	nw	3775	0.104%	96.81%
135	kr	3677	0.102%	96.92%
136	bm	3623	0.100%	97.02%
137	ks	3617	0.100%	97.12%
138	ft	3457	0.096%	97.21%
139	ko	3417	0.094%	97.31%
140	pt	3179	0.088%	97.39%
141	hu	3112	0.086%	97.48%
142	tw	3096	0.086%	97.57%
143	my	3084	0.085%	97.65%
144	hp	3078	0.085%	97.74%
145	ao	3060	0.085%	97.82%
146	ln	2906	0.080%	97.90%
147	iz	2849	0.079%	97.98%
148	gl	2533	0.070%	98.05%
149	dy	2494	0.069%	98.12%
150	ju	2485	0.069%	98.19%
151	px	2426	0.067%	98.25%
152	jo	2400	0.066%	98.32%
153	sw	2342	0.065%	98.39%
154	rv	2279	0.063%	98.45%
155	ez	2215	0.061%	98.51%
156	gs	2012	0.056%	98.57%
157	fn	1976	0.055%	98.62%
158	ej	1800	0.050%	98.67%
159	ix	1785	0.049%	98.72%
160	hy	1756	0.049%	98.77%
161	bs	1744	0.048%	98.82%
162	rw	1699	0.047%	98.86%
163	ax	1686	0.047%	98.91%
164	eq	1652	0.046%	98.96%
165	kl	1620	0.045%	99.00%
166	nv	1615	0.045%	99.04%
167	tx	1530	0.042%	99.09%
168	cy	1513	0.042%	99.13%
169	hn	1437	0.040%	99.17%
170	az	1425	0.039%	99.21%
171	aj	1327	0.037%	99.24%
172	lm	1304	0.036%	99.28%
173	iy	1287	0.036%	99.32%
174	mn	1201	0.033%	99.35%
175	dg	1176	0.033%	99.38%
176	mt	1164	0.032%	99.41%
177	lv	1147	0.032%	99.45%
178	py	1071	0.030%	99.48%
179	lw	1063	0.029%	99.50%
180	cx	901	0.025%	99.53%
181	gt	742	0.021%	99.55%
182	fs	664	0.018%	99.57%
183	gy	654	0.018%	99.59%
184	dm	638	0.018%	99.60%
185	ox	638	0.018%	99.62%
186	bj	634	0.018%	99.64%
187	hl	621	0.017%	99.66%
188	dv	617	0.017%	99.67%
189	bt	608	0.017%	99.69%
190	dw	511	0.014%	99.70%
191	hm	455	0.013%	99.72%
192	iq	442	0.012%	99.73%
193	ky	437	0.012%	99.74%
194	oz	407	0.011%	99.75%
195	qs	398	0.011%	99.76%
196	jn	376	0.010%	99.77%
197	wy	360	0.010%	99.78%
198	fy	322	0.009%	99.79%
199	ux	305	0.008%	99.80%
200	uy	275	0.008%	99.81%
201	gm	263	0.007%	99.82%
202	np	235	0.006%	99.82%
203	vy	232	0.006%	99.83%
204	dj	231	0.006%	99.84%
205	dh	222	0.006%	99.84%
206	bh	215	0.006%	99.85%
207	bv	214	0.006%	99.85%
208	cm	201	0.006%	99.86%
209	nq	193	0.005%	99.86%
210	bn	188	0.005%	99.87%
211	hk	184	0.005%	99.87%
212	uv	178	0.005%	99.88%
213	ku	177	0.005%	99.88%
214	yz	170	0.005%	99.89%
215	ij	166	0.005%	99.89%
216	fm	160	0.004%	99.90%
217	tz	158	0.004%	99.90%
218	kw	154	0.004%	99.91%
219	bd	151	0.004%	99.91%
220	uz	148	0.004%	99.92%
221	cq	144	0.004%	99.92%
222	dt	137	0.004%	99.92%
223	hx	131	0.004%	99.93%
224	lz	128	0.004%	99.93%
225	fk	117	0.003%	99.93%
226	nz	111	0.003%	99.94%
227	nx	102	0.003%	99.94%
228	pw	98	0.003%	99.94%
229	xy	90	0.002%	99.94%
230	cd	89	0.002%	99.95%
231	fh	83	0.002%	99.95%
232	jr	83	0.002%	99.95%
233	sv	81	0.002%	99.95%
234	gk	80	0.002%	99.96%
235	uw	80	0.002%	99.96%
236	mw	79	0.002%	99.96%
237	df	78	0.002%	99.96%
238	bw	77	0.002%	99.96%
239	km	72	0.002%	99.97%
240	dq	68	0.002%	99.97%
241	kt	67	0.002%	99.97%
242	fw	66	0.002%	99.97%
243	fg	65	0.002%	99.97%
244	aq	64	0.002%	99.98%
245	fp	62	0.002%	99.98%
246	kp	62	0.002%	99.98%
247	bk	42	0.001%	99.98%
248	dk	42	0.001%	99.98%
249	qr	41	0.001%	99.98%
250	bg	40	0.001%	99.98%
251	oq	40	0.001%	99.98%
252	rz	38	0.001%	99.99%
253	dp	32	0.001%	99.99%
254	bp	26	0.001%	99.99%
255	bc	25	0.001%	99.99%
256	gp	25	0.001%	99.99%
257	cw	24	0.001%	99.99%
258	gw	24	0.001%	99.99%
259	rx	24	0.001%	99.99%
260	hz	23	0.001%	99.99%
261	jk	23	0.001%	99.99%
262	sz	23	0.001%	99.99%
263	lx	22	0.001%	99.99%
264	fx	20	0.001%	99.99%
265	bf	18	0.000%	99.99%
266	cz	18	0.000%	99.99%
267	hq	18	0.000%	100.00%
268	lq	17	0.000%	100.00%
269	wx	15	0.000%	100.00%
270	kz	13	0.000%	100.00%
271	cf	11	0.000%	100.00%
272	cp	10	0.000%	100.00%
273	gz	10	0.000%	100.00%
274	bz	9	0.000%	100.00%
275	hv	9	0.000%	100.00%
276	vz	9	0.000%	100.00%
277	qx	7	0.000%	100.00%
278	mv	6	0.000%	100.00%
279	wz	6	0.000%	100.00%
280	jp	5	0.000%	100.00%
281	js	4	0.000%	100.00%
282	tv	4	0.000%	100.00%
283	dz	3	0.000%	100.00%
284	mz	3	0.000%	100.00%
285	sx	3	0.000%	100.00%
286	bx	2	0.000%	100.00%
287	fj	2	0.000%	100.00%
288	hj	2	0.000%	100.00%
289	jy	2	0.000%	100.00%
290	qw	2	0.000%	100.00%
291	cv	1	0.000%	100.00%
292	fz	1	0.000%	100.00%
293	gv	1	0.000%	100.00%
294	jt	1	0.000%	100.00%
295	kv	1	0.000%	100.00%
296	mx	1	0.000%	100.00%
297	qv	1	0.000%	100.00%
298	qy	1	0.000%	100.00%
299	vx	1	0.000%	100.00%
300	bq	0	0.000%	100.00%
301	cg	0	0.000%	100.00%
302	cj	0	0.000%	100.00%
303	dx	0	0.000%	100.00%
304	fq	0	0.000%	100.00%
305	fv	0	0.000%	100.00%
306	gj	0	0.000%	100.00%
307	gq	0	0.000%	100.00%
308	gx	0	0.000%	100.00%
309	jl	0	0.000%	100.00%
310	jm	0	0.000%	100.00%
311	jq	0	0.000%	100.00%
312	jv	0	0.000%	100.00%
313	jw	0	0.000%	100.00%
314	jx	0	0.000%	100.00%
315	jz	0	0.000%	100.00%
316	kq	0	0.000%	100.00%
317	kx	0	0.000%	100.00%
318	mq	0	0.000%	100.00%
319	pq	0	0.000%	100.00%
320	pv	0	0.000%	100.00%
321	pz	0	0.000%	100.00%
322	qt	0	0.000%	100.00%
323	qz	0	0.000%	100.00%
324	vw	0	0.000%	100.00%
325	xz	0	0.000%	100.00%
合計		3616808	100.000%