So if you look a the image I extruded the side and filled a face at top, the bottom is empty and I wanted to create a loop around the 3 sides but it will only appear for one side any tips. 
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2$\begingroup$ related blender.stackexchange.com/questions/7990/… $\endgroup$– user1853Commented Nov 29, 2014 at 14:38
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1$\begingroup$ Have you tried pressing W > remove doubles $\endgroup$– PGmathCommented Nov 29, 2014 at 14:38
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$\begingroup$ That worked thanks, is there any signs I can look out for to know I have a double. $\endgroup$– hghjgjhCommented Nov 29, 2014 at 14:41
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1$\begingroup$ I have not really paid super close attention to what makes double vertices. I think they are just artifacts of some algorithms, when ever I have peculiar things like this happening I usually try removing doubles first. If that doesn't work the problem is probably n-gons or non-manifold geometry (see the question stacker linked). $\endgroup$– PGmathCommented Nov 29, 2014 at 14:46
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