As a result, he concluded that the vowels that were previously considered to have the distinction between A-type and B-type indicated complementary distribution and thus these vowels were not distinguished from each other but their phonemes were identical.
その結果、従来甲乙2種の使い分けがあるとされてきた母音は相補的な分布を示すなどしており、母音の使い分けを行なっていたわけではなく音韻的には同一であったとした。