( 31 ) Development of class 2.4 and 2.5 * proto - Japanese 2.1 / 2.2 / 2.3 / 2.4 , 2.5 * proto - Ryukyuan 2.1 / 2.2 /2.3 / 2.4a , 2.5a / 2.4b , 2.5b ...
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