diff --git a/engine-proto/gram-test/circles-in-triangle.jl b/engine-proto/gram-test/circles-in-triangle.jl
index bd6a503..2bca4f2 100644
--- a/engine-proto/gram-test/circles-in-triangle.jl
+++ b/engine-proto/gram-test/circles-in-triangle.jl
@@ -31,6 +31,11 @@ end
 append!(J, [6, 4, 6, 5, 7, 5, 7, 3, 8, 3, 8, 4])
 append!(K, [4, 6, 5, 6, 5, 7, 3, 7, 3, 8, 4, 8])
 append!(values, fill(-1, 12))
+#= make construction rigid
+append!(J, [3, 4, 4, 5])
+append!(K, [4, 3, 5, 4])
+append!(values, fill(-0.5, 4))
+=#
 gram = sparse(J, K, values)
 
 # set initial guess (random)
@@ -42,6 +47,7 @@ gram = sparse(J, K, values)
 ## guess = Engine.rand_on_shell(fill(BigFloat(-1), 8))
 
 # set initial guess
+#=
 guess = hcat(
   Engine.plane(BigFloat[0, 0, 1], BigFloat(0)),
   Engine.sphere(BigFloat[0, 0, 0], BigFloat(1//2)),
@@ -52,6 +58,17 @@ guess = hcat(
   Engine.sphere(BigFloat[cos(-pi/3), sin(-pi/3), 0], BigFloat(1//5)),
   Engine.sphere(BigFloat[cos(pi/3), sin(pi/3), 0], BigFloat(1//5))
 )
+=#
+guess = hcat(
+  Engine.plane(BigFloat[0, 0, 1], BigFloat(0)),
+  Engine.sphere(BigFloat[0, 0, 0], BigFloat(0.9)),
+  Engine.plane(BigFloat[1, 0, 0], BigFloat(1)),
+  Engine.plane(BigFloat[cos(2pi/3), sin(2pi/3), 0], BigFloat(1)),
+  Engine.plane(BigFloat[cos(-2pi/3), sin(-2pi/3), 0], BigFloat(1)),
+  Engine.sphere(4//3*BigFloat[-1, 0, 0], BigFloat(1//3)),
+  Engine.sphere(4//3*BigFloat[cos(-pi/3), sin(-pi/3), 0], BigFloat(1//3)),
+  Engine.sphere(4//3*BigFloat[cos(pi/3), sin(pi/3), 0], BigFloat(1//3))
+)
 
 # complete the gram matrix using gradient descent
 L, history = Engine.realize_gram(gram, guess, max_descent_steps = 200)