Write a function called list_codons which takes a single argument called orf (expected to be a string representing an ORF sequence). The purpose of this function is to produce a list of codons in the ORF. The function should perform the following tasks:
a. Check if the provided string meets the minimum requirements of an ORF sequence. Specifically, call the possibly_orf function to perform this check. If possibly_orf function returns True, the function should continue to the next step, otherwise the function should return an empty list.
b. Use a for loop with the help of Python's built-in range function to produce a list of codons in the orf. You will first need to create an empty list: codon_list = [] which will then be populated during the execution of the for loop.
c. The function should return the populated codon_list.
You can check if your function works correctly by running the following test cases. Notice the expected output. Your function should perform identically:
In [1] : list_codons ('AGUAGGAUAAGAAGU')
The first codon is not AUG.
Out [1] : []
In [2] : list_codons ('AUGAGGAUAAGAUGA)
The sequence is possibly an ORF.
Out [2] : ['AUG', 'AGG', 'AUA', 'AGA', 'UGA']

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: ['AUG', 'AGG', 'AUA', 'AGA', 'UGA']

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