I have a question regarding exercise 1, chapter 4, Introductory Phonology by Bruce Hayes.
Suppose we have the features high, low, back, round. We are given the table below, representing the vowels of a hypothetical language.
Vowels: Front Back
Unrounded Rounded Unrounded Rounded
high i y ɯ u
mid e ø ˠ o
low æ Œ ɑ ɒ
My problem is about this question: Find as many natural classes as you can that have five members.
For natural classes that have four members, for example, I could think of the class [+high] or [+low]. But how about a five-member class?
Thanks in advance!