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+RAx = 0
+RAy + REy = L
+REy = 1/2 L
+RAx - AB - AK cos a = 0
+RAy - AK sin a = 0
+AB + BK cos d - BH cos d - BC = 0
+BK sin d + BH sin d = -1/3 L
+BC + CJ cos d - CG cos d - CD = 0
+CJ sin d + CG sin d = -1/3 L
+CD + ID cos d - DF cos d - DE = 0
+ID sin d + DF sin d = -1/3 L
+DE + FE cos a = 0
+REy - FE sin a = 0
+DF cos d + GF cos b - EF cos a = 0
+DF sin d - GF sin b + EF sin a = 0
+CG cos d + GH cos c - FG cos b = 0
+CG sin d - GH sin c + FG sin b = 0
+IH + BH cos d - HG cos c = 0
+# BH sin d + HG sin c = 0
+# IJ cos c - ID cos d - IH = 0
+JI sin c + ID sin d = 0
+# JK cos b - CJ cos d - IJ cos c = 0
+AK cos a - BK cos d - JK cos b = 0
+
+order: RAx RAy REy AB BC CD DE EF FG GH HI IJ JK KA BK CJ DI BH CG DF
+
+map: cos a = Ca
+map: cos b = Cb
+map: cos c = Cc
+map: cos d = Cd
+map: sin a = Sa
+map: sin b = Sb
+map: sin c = Sc
+map: sin d = Sd
+
+map: -1/3 L = -(1/3)*load
+map: 1/2 L = (1/2)*load
+map: L = load
+map: matrix = Coef