| 1 | This is a parabola and it is completely symmetric. | |
| 2 | Upswept roofs and parabolas cropped up on buildings. | |
| 3 | It's, again, a parabola going downwards. | |
| 4 | So, we should draw maybe this downward parabola. | |
| 5 | See, it's the same with a parabola going upwards. |
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