I'm not sure if I understood what complementary distribution and defective distribution mean.
I have a definition that complementary distribution is an automatic, i.e. obligatory positional variation of a certain phoneme that always occurs in a certain position. I'm not completely sure what defective distribution is though. I found that defective distribution is when a certain phoneme occurs only in some contexts.
If we take for example that in English, word-initial stops are always aspirated: e.g. pin [pʰ] as opposed to spin [p], then, would this be an example of complementary distribution or defective distribution?
Am I right in thinking this is complementary distribution? It can't be defective distribution since aspirated stops don't occur only word-initially. They can also occur inside words, e.g. potato.