Instructions:

Height: high (close)
Backness: central
Rounded: unrounded

Occurrence:
Acehnese, Angor, Czech (Some dialects), Chinese (Mandarin), English (Cockney, Southeastern English), Guarani, Irish (Munster), Kaingang, Mapudungun, Mongolian, Muisca (Hycha), Romanian, Russian, Sahaptin, Sirionó, Swedish, Tupi, Udmurt, Vietnamese, Võro, Welsh (Northern dialects), Zapotec (Tilquiapan)
(Source: https://en.wikipedia.org/wiki/Close_central_unrounded_vowel#Occurrence)