Then, there is an "unwritten rule": the state is coherent if there are more Greek characters than Latin characters in the argument, and photon state if the Latin characters dominate.
ðˈɛn, ðˈɛɹ ɪz æn "ʌnɹˈɪʔn̩ ɹˈuːl": ðə stˈeɪt ɪz koʊhˈɪɹənt ɪf ðɛɹˌɑːɹ mˈoːɹ ɡɹˈiːk kˈæɹɪktɚz ðɐn lˈætɪn kˈæɹɪktɚz ɪnðɪ ˈɑːɹɡjuːmənt, ænd fˈoʊtɑːn stˈeɪt ɪf ðə lˈætɪn kˈæɹɪktɚz dˈɑːmᵻnˌeɪt.