I deleted vertices, edges and faces on the red faces. But the lines remain on the object.
I can not even select the lines.(including vertex, edge, face)
how can I remove the lines?
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1$\begingroup$ You probably pressed the letter P and separated that section into another object. $\endgroup$ – user1853 Jul 31 '15 at 17:34
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It most propably became another object, try exiting from the edit mode and selecting those lines
answered Jul 31 '15 at 15:33
