p(x_2)&=a_0 + a_1 x_2 + a_2 x_2^2 + \cdots a_n x_2^n = y_2\\
FT Professional
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A few of them are almost certainly shortcomings in Ostrich, while others seem to intend to match literal full strings, like ^(로그인하지 않고)$ ("without logging in"). Presumably they're from internal use.
set(key: string, value: T) {