SN4 ""

No	Pattern	Freq
1	an [adj] [noun] for	4474
2	an [adj] [noun] for	4448
3	an [adj] [noun sg] for	4418
4	an important [noun] for	276
5	an important [noun] for	276
6	an ideal [noun] for	268
7	an ideal [noun] for	268
8	an excellent [noun] for	207
9	an excellent [noun] for	207
10	an appropriate [noun] for	123
11	an appropriate [noun] for	123
12	an alternative [noun] for	96
13	an alternative [noun] for	96
14	an essential [noun] for	85
15	an easy [noun] for	85
16	an essential [noun] for	85
17	an [adj] demand for	83
18	an [adj] demand for	83
19	an easy [noun] for	80
20	an [adj] need for	79
21	an [adj] need for	79
22	an additional [noun] for	72
23	an additional [noun] for	72
24	an obvious [noun] for	70
25	an obvious [noun] for	70
26	an extra [noun] for	69
27	an extra [noun] for	69
28	an urgent [noun] for	65
29	an urgent [noun] for	65
30	an adequate [noun] for	63