A wheel is an algebraic structure satisfying(for all values formula_2, formula_3, and formula_4):
ʌ WORD_BOUNDARY w iː l WORD_BOUNDARY ɪ z WORD_BOUNDARY ʌ n WORD_BOUNDARY æ l d̠ʒ ɪ b ɹ eɪ ɪ k WORD_BOUNDARY s t ɹ ʌ k t̠ʃ ə ɹ WORD_BOUNDARY s æ t ɪ s f aɪ ɪ ŋ WORD_BOUNDARY f ɔ ɹ WORD_BOUNDARY ɔ l WORD_BOUNDARY v æ l j uː z WORD_BOUNDARY f ɔ ɹ m j ʊ l ə WORD_BOUNDARY t uː WORD_BOUNDARY f ɔ ɹ m j ʊ l ə WORD_BOUNDARY θ ɹ iː WORD_BOUNDARY æ n d WORD_BOUNDARY f ɔ ɹ m j ʊ l ə WORD_BOUNDARY f ɔ ɹ WORD_BOUNDARY