计算储存在 QR 编码中的表达式
perceived
带有 L 纠错的 QR 条形码可以存储7089个数字，4296个字母数字字符或2953个 ASCII 字符.
| In[1]:= |  X |
| Out[1]= |  |
| In[2]:= |  X |
| Out[2]= |  |
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