four days a week
four day a week
det:num n det:art n
four days a week.
f ɔ ɹ WORD_BOUNDARY d eɪ z WORD_BOUNDARY ʌ WORD_BOUNDARY w iː k WORD_BOUNDARY
f o u r WORD_BOUNDARY d a y s WORD_BOUNDARY a WORD_BOUNDARY w e e k . WORD_BOUNDARY