Matsumoto criticized Arisaka's Laws for the combination of syllables that the idea of 'combined into one unit' was ambiguous, and insisted that the laws for the combination should be investigated in relation to all vowels, not only the vowels that had the distinction between A-type and B-type.
松本は有坂の音節結合の法則について、「同一結合単位」という概念の曖昧さを指摘した上で甲乙2種の使い分けがある母音だけではなく全ての母音について結合の法則性を追求すべきだとした。