Given the following sequence, identify which is arithmetic sequence. Write AS if it is an arithmetic sequence and NAS if it's not.
1. ,9,10,21,22
2. 3,12,21,30,39
3. -1, 7,15,23,31,39
4. 2,12,20,26,30
5. 8,3, -2, -7, -12
1. ,9,10,21,22
2. 3,12,21,30,39
3. -1, 7,15,23,31,39
4. 2,12,20,26,30
5. 8,3, -2, -7, -12
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1.NAS
2.AS
3.AS
4.NAS
5.NAS