略称わけわからんが、合ってる？

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Redmi 4 a = r4a
　MSM8917 Snapdragon 425 , 1.4 GHz , 2GB , 16GB
　5.0inch(720x1280) , 3120mAh

Redmi 4 = r4
　MSM8937 Snapdragon 430 , 1.4GHz , 2GB , 16GB
　5.0inch(720x1280) , 4100mAh

Redmi 4 prime = r4p
　MSM8953 Snapdragon 625 , 2.0GHz , 3GB , 32GB
　5.0inch(1080x1920) , 4100mAh

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Redmi Pro = rp
　Exclusive edition
　　MT6797T Helio X25 , 2.5GHz , 4GB , 128GB
　High edition
　　MT6797T Helio X25 , 2.3GHz , 3GB , 64GB
　Standard edition
　　MT6797 Helio X20 , 2.1GHz , 3GB , 32GB

　5.5inch(1080x1920) , 4050mAh

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Redmi Note 4
　Standard edition = rn4
　　MT6797 Helio X20 , 2.1GHz , 2GB , 16GB

　High edition = rn4p
　　MT6797 Helio X20 , 2.1GHz , 3GB , 64GB

　5.5inch(1080x1920) , 4100mAh

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