Co ordinates for Sample Image.

10, 10 Cusp Line
10, 155 Cusp Line
38, 228 Tangent Cusp (Smoot Symetric, Curve Before, Curve after) *
121, 290 Cusp Line
204, 228 Tangent Cusp (Smoot Symetric, Curve Before, Curve after) 
232, 155 Cusp Line
232, 10 Cusp Line

Then use the edit > close Option.

* this will appear in the Status bar, Make the Curves at 45 degrees and a length of 28x28px