A field is a ring (so it follows the rules above), with these extra rules:
ʌ WORD_BOUNDARY f iː l d WORD_BOUNDARY ɪ z WORD_BOUNDARY ʌ WORD_BOUNDARY ɹ ɪ ŋ WORD_BOUNDARY s oʊ WORD_BOUNDARY ɪ t WORD_BOUNDARY f ɑ l oʊ z WORD_BOUNDARY ð ə WORD_BOUNDARY ɹ uː l z WORD_BOUNDARY ə b ʌ v WORD_BOUNDARY w ɪ ð WORD_BOUNDARY ð iː z WORD_BOUNDARY ɛ k s t ɹ ə ɹ WORD_BOUNDARY ɹ uː l z WORD_BOUNDARY