diff --git a/src/OrbitDecomposition.jl b/src/OrbitDecomposition.jl
index ccfc503..16a3ded 100644
--- a/src/OrbitDecomposition.jl
+++ b/src/OrbitDecomposition.jl
@@ -79,14 +79,14 @@ function orbit_spvector(vect::AbstractVector, orbits)
     return orb_vector
 end
 
-function orbit_constraint(constraints::Vector{Vector{Vector{Int64}}}, n)
+function orbit_constraint(constraints::Vector{Vector{Tuple{Int,Int}}}, n)
     result = spzeros(n,n)
     for cnstr in constraints
         for p in cnstr
-            result[p[2], p[1]] += 1.0
+            result[p[2], p[1]] += 1.0/length(constraints)
         end
     end
-    return 1/length(constraints)*result
+    return result
 end
 
 ###############################################################################
diff --git a/src/PropertyT.jl b/src/PropertyT.jl
index 2c2f7a4..32d4897 100644
--- a/src/PropertyT.jl
+++ b/src/PropertyT.jl
@@ -88,7 +88,7 @@ function ΔandSDPconstraints(prefix::String, G::Group)
     pm_fname, Δ_fname = pmΔfilenames(prefix)
 
     product_matrix = load(pm_fname, "pm")
-    sdp_constraints = constraints_from_pm(product_matrix)
+    sdp_constraints = constraints(product_matrix)
 
     RG = GroupRing(G, product_matrix)
     Δ = GroupRingElem(load(Δ_fname, "Δ")[:, 1], RG)
@@ -107,15 +107,15 @@ end
 
 function ΔandSDPconstraints{T<:GroupElem}(S::Vector{T}, Id::T; radius::Int=2)
     info(logger, "Generating balls of sizes $sizes")
-    @logtime logger B, sizes = Groups.generate_balls(S, Id, radius=2*radius)
+    @logtime logger E_R, sizes = Groups.generate_balls(S, Id, radius=2*radius)
 
     info(logger, "Creating product matrix...")
-    @logtime logger pm = GroupRings.create_pm(B, GroupRings.reverse_dict(B), sizes[radius]; twisted=true)
+    @logtime logger pm = GroupRings.create_pm(E_R, GroupRings.reverse_dict(E_R), sizes[radius]; twisted=true)
 
     info(logger, "Creating sdp_constratints...")
-    @logtime logger sdp_constraints = PropertyT.constraints_from_pm(pm)
+    @logtime logger sdp_constraints = PropertyT.constraints(pm)
 
-    RG = GroupRing(parent(Id), B, pm)
+    RG = GroupRing(parent(Id), E_R, pm)
 
     Δ = splaplacian(RG, S)
     return Δ, sdp_constraints
diff --git a/src/SDPs.jl b/src/SDPs.jl
index 972f3b5..a12d166 100644
--- a/src/SDPs.jl
+++ b/src/SDPs.jl
@@ -1,13 +1,13 @@
 using JuMP
 import MathProgBase: AbstractMathProgSolver
 
-function constraints_from_pm(pm, total_length=maximum(pm))
+function constraints(pm, total_length=maximum(pm))
     n = size(pm,1)
-    constraints = [Array{Int,1}[] for x in 1:total_length]
+    constraints = [Vector{Tuple{Int,Int}}() for _ in 1:total_length]
     for j in 1:n
         for i in 1:n
             idx = pm[i,j]
-            push!(constraints[idx], [i,j])
+            push!(constraints[idx], (i,j))
         end
     end
     return constraints