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Find the next three terms in each sequence.
1. 1,2,3, 3c, 5e, 7g, 9i, ____, ____, ____ *
2. -2, -4, -6, ____, ____, ____ *
3. 12, 13, 14, 15, ____, ____, ____ *
4. 0a,3b,8c,15d, ____, ____, ____ *
5. 5, 10, 15, 20, ____, ____, ____ *