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My task is to detect the sequence type, which is one of the following:
List item
Fixed step
1, 2, 3, 4, 5, ... (step = 1)
1, 5, 9, 13, ... (step = 4)
Gradually changing step (step increases by a fixed amount after each number)
1, 2, 4, 7, 11, ... (step = 1, 2, 3, ...)
1, 3, 7, 13, 21, ... (step...