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| doc#129 | is a ruled surface of order <formul> |
| doc#129 | into a ruled surface of order <formul> |
| doc#129 | Since a ruled surface of order n |
| doc#129 | a nonsingular quadric surface . </p><p> We now |
| doc#129 | on a quadric surface . </p><p> Continuing with |
2.35.2-open-2.150-open-3.97.6