ðeɪ ɑːɹ ᵻlˈɛvən ɡɹˈuːps wɪðˌaʊt ðə sˈɛntɚɹ ʌv ˈæntaɪɪnvˈɜːʒən fˈoːɹhˈʌndɹɪd θˈɜːɾi tˈuː, fˈoːɹɾi θɹˈiː m, ˈɛm θɹˈiː ˈɛm, fˈoːɹhˈʌndɹɪd twˈɛnti tˈuː, fˈoːɹ ˌɛmˈɛm, fˈoːɹ tˈuː ˈɛm, fˈoːɹ slˈæʃ ˌɛmˌɛmˈɛm, sˈɪkshˈʌndɹɪd twˈɛnti tˈuː, sˈɪks ˌɛmˈɛm, sˈɪks m tˈuː ænd sˈɪks slˈæʃ ˌɛmˌɛmˈɛm.
They are eleven groups without the center of anti-inversion 432, 43'm, m3m, 422, 4mm, 4'2m, 4/mmm, 622, 6mm, 6'm2 and 6/mmm.