4 Forbidden Phonemes

The 4 Forbidden Phonemes are distinct linguistic sounds so strange and horrible they have been made illegal under international law. To read them aloud is to consign you and those around you to a strange and horrible death. Here is a list of them and rough pronunciations.
 * 1) /Ω/: The sound made by a dying grouse after realising he left the oven on, as in: Aewfndiewfhniefw.
 * 2) /ɐ/: The sound of a cry for help that will not be answered, as in: ᴉʞᴉʍ ɐ uᴉ pǝddɐɹʇ ɯ,ᴉ dlǝɥ.
 * 3) /☭/: The sound of the GLORIOUS DIALECTICAL SCIENCE OF THE VANGUARD PARTY, as in: WORKERS OF THE WORLD, UNITE! YOU HAVE NOTHING TO LOSE BUT YOUR CHAINS!
 * 4) /Ҕ/: The sound made by a Welshman stabbed while gargling, as in: Llypgrynllamnsai.