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|link4title=Portal Player | |link4title=Portal Player | ||
|link4=[https://player.theportal.dev/?ep=20:_Sir_Roger_Penrose_-_Plotting_the_Twist_of_Einstein%E2%80%99s_Legacy Link] | |link4=[https://player.theportal.dev/?ep=20:_Sir_Roger_Penrose_-_Plotting_the_Twist_of_Einstein%E2%80%99s_Legacy Link] | ||
|link4title=Blog Post | |||
|link4=[https://theportal.group/20-roger-penrose-plotting-the-twist-of-einsteins-legacy/ Read] | |||
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|next=ep21 | |next=ep21 |