SN4 ""

No	Pattern	Freq
1	[num] had been	613
2	[num] has been	467
3	[num] have been	421
4	million have been	110
5	two have been	63
6	three have been	49
7	1980s have been	48
8	four have been	33
9	1992 have been	33
10	1990 have been	29
11	1991 have been	28
12	five have been	26
13	[num] having been	25
14	1979 have been	21
15	six have been	19
16	2 have been	17
17	1989 have been	17
18	1988 have been	16
19	3 have been	15
20	1970s have been	15
21	[num] to have been	15
22	ii have been	15
23	4 have been	14
24	billion have been	13
25	1 have been	13
26	one have been	13
27	iii have been	12
28	thousands have been	12
29	eight have been	12
30	20 have been	11