True, but have you done that with a single brush restriction? Why do it with a single brush? why not? Perhaps as a challenge? knowing the deepest and darkest brush techniques? choose your reason, its knowledge.
compare with http://i.imgur.com/Poadwl9.png
How to turn that odly placed 4-gon into two triangles?
press Ctrl + f when selecting these two vertices. apply to all 4 sides.
that turns it into this, which is a valid solid

compare with http://i.imgur.com/Poadwl9.png
How to turn that odly placed 4-gon into two triangles?
press Ctrl + f when selecting these two vertices. apply to all 4 sides.

that turns it into this, which is a valid solid

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