Write a Julia function to produce a step plot based on sorted dates in column 1 and labels in column 2 that indicate an increment/decrement as follows: x1-inc, x2-inc, x3-inc, x1-dec, x4-inc, x3-dec, x2-dec, etc. The plot shows the cumulative count over time, with labels x1, x2, etc in green for increments and red for decrements  Write your response using less than 300 words.
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