10.14. Self Check

Please put the step method that finds all cells above k and topples them.

        def step(self, K=3):
---
    toppling = self.array > K
    ---
    num_toppled = np.sum(toppling)
    ---
    c = correlate2d(toppling, self.kernel, mode='same')
    ---
    self.array += c
    ---
    return num_toppled
        

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