Informal, formal, and environmental
1- informal
2-informal
3-informal
6-formal
7-formal
8-informal
9-informal
13-formal
15-environmental
16-environmental
17-formal
18-environmental
24-environmental
25-environmental
26-formal
27-informal
29-formal
30-environmental
31-informal
32-informal
33-informal
34-informal
35-environmental
36-environmental
37-informal
38-informal
39-informal
40-formal
41-environmental
42-environmental
43-formal
44-informal
46-formal
48-informal
49-environmental
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