Question: Write the function collatz(n). This takes as its input the start value of n and calculates the length of the Collatz sequence, starting with n.

Write the function collatz(n). This takes as its input the start value of n and calculates the length of the Collatz sequence, starting with n.

>>> collatz(12)

The function should receive an integer, generate the sequence, calculate its length, and then return this value. For example, for n = 12, it should generate [12, 6, 3, 10, 5, 16, 8, 4, 2, 1], calculate the length, and return 10.

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