For the 17th century entry of ɐ, what is Semi-closed initial unstressed vowels?
CREATE TABLE "initial_unstressed_syllables" (
  "semi_closed_initial_unstressed_vowels" text,
  "17th_c" text,
  "american" text,
  "australian" text,
  "examples" text
);
SELECT "semi_closed_initial_unstressed_vowels" FROM "initial_unstressed_syllables" WHERE "17th_c"='ɐ';