1 & x_2 & x_2^2 & \dots & x_2^{n-1}\\
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,这一点在heLLoword翻译官方下载中也有详细论述
Film type: Polaroid i-Type Color Film (sold separately) / Film size: 4.2 x 3.5-inch prints / Weight: 648 grams / Charging method: USB-C / Companion app: Yes / Other features: Flip-up lid, scene analysis feature
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