Design a Butterworth digital IIR low pass filter using Billinear transformation by taking T=0.5 second, to satisfy the following specification.

$\begin{aligned} 0.707 \leq &\left|\mathrm{H}\left(\mathrm{e}^{\mathrm{jw}} | \leq 1.0 : 0 \leq \mathrm{w} \leq 0.45 \pi\right.\right.\\\left|\mathrm{H}\left(\mathrm{e}^{\mathrm{jw}} | \leq 0.2\right.\right.& : 0.65 \pi \leq \mathrm{w} \leq \pi \end{aligned}$

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