1. Formal
2. formal
3.informal
4.environmental
5.informal
6.informal
7.informal
8. environmental
9.informal
10.formal
11.formal
12.informal
13.formal
14.environmental
15.informal
16.formal
17.environmental
18.informal
19.formal
20.formal
21.formal
22.formal
23.informal
24.formal
25.formal
26.environmental
27.informal
28.formal
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