Can someone me with this? i need it quickly! you so much!

1 J

2 n

3 e

4 b

5 r

6 h

7 k

8 a

9 p

10 s

11 c

12 f

13 t

14 d

15 m

16 i

17 g

18 q

19 l

20 o

- "the basic difference between keywords and subjects is that subjects (or "subject headings") have been predetermined, while keywords have not. a keyword is an easy place to start because you can use any word that seems to fit your search; this is called "natural language" searching."

i'm thinking it would be when compound subjects are joined by or, nor,either-or, neither-nor.