This is a sub-problem of the long problem for this assignment, namely, rhyming words. Write a function primary_stress_position(phoneme_list) that behaves as follows. The argument phoneme_list is a list of phonemes, as describedhere. It returns an integer that is the position of the primary stress phoneme (i.e., the phoneme with the main stress) in phoneme_list. If there is no primary stress in phoneme_list, your function should return None.

This document describes how the primary-stress phoneme is indicated.

You can assume that there is at most one primary-stress phoneme in phoneme_list.

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