dᵻspˈaɪt ðə fˈækt ðæt sˌʌm kɹˈɪstəl ɡɹˈuːps ʌv sˈɪmətɹi ɑːɹ dɪvˈɔɪd ʌvðə sˈɛntɚɹ ʌv ˈæntaɪɪnvˈɜːʒən, ðeɪ ˈɔːlsoʊ dˈoʊnt hæv kjˌuːˌɛmˈɑːɹ bɪkˈʌz ʌv ˈækʃən ʌv ˈʌðɚɹ ˈɑːpɚɹˌeɪɾɚz ʌv sˈɪmətɹi.
Despite the fact that some crystal groups of symmetry are devoid of the center of anti-inversion, they also don’t have QMR because of action of other operators of symmetry.