WHAT DOES NASCENCY ANTONYMS MEAN?

There aren't any minimal pairs for tense/lax pairs which include /ʊ/ and /u/ in unstressed syllables, mainly because they are in complementary distribution. They don't seem to be genuinely unique phonemes.I think the dialogue about /x/ and /χ/ is superfluous. I checked quite a few WIKI-pages and when the a person suggests that /x/ is Incorrect an