diff --git a/examples/complex.cpp b/examples/complex.cpp
index 59b4780..dd8592d 100644
--- a/examples/complex.cpp
+++ b/examples/complex.cpp
@@ -9,11 +9,11 @@ template<class G>
 void test(const G &group, unsigned int N) {
     auto s = std::clock();
     auto combos = tc::combinations(group.gens, N - 1);
-    auto data = tc::merge(tc::hull(group, combos, {}));
+    auto data = tc::merge(tc::hull(group, combos));
     auto e = std::clock();
 
     double diff = (double) (e - s) / CLOCKS_PER_SEC;
-    int count = data.size();
+    int count = data.cols();
 
     std::cout
         << std::setw(2) << N << ", "
diff --git a/include/tc/complex.hpp b/include/tc/complex.hpp
index 31f5d58..b915b19 100644
--- a/include/tc/complex.hpp
+++ b/include/tc/complex.hpp
@@ -31,22 +31,16 @@ namespace tc {
         return combos;
     }
 
-    std::vector<Symbol> fan(const std::vector<Symbol>& prims, int root) {
-        std::vector<Symbol> res;
-        res.reserve(prims.size());
-        for (const auto &prim: prims) {
-            Symbol s(prim.size() + 1);
-            s << prim, root;
-            res.push_back(s);
-        }
+    ArrayXui fan(const ArrayXui &prims, int root) {
+        ArrayXui res(prims.rows() + 1, prims.cols());
+        res.topRows(prims.rows()) << prims;
+        res.bottomRows(1).fill(root);
         return res;
     }
 
-    void apply(const tc::Cosets &table, unsigned int gen, std::vector<Symbol> &prims) {
-        for (auto &prim: prims) {
-            for (auto &ind : prim) {
-                ind = table.get(ind, gen);
-            }
+    void apply(const tc::Cosets &table, unsigned int gen, ArrayXui &prims) {
+        for (Eigen::Index i = 0; i < prims.size(); ++i) {
+            prims(i) = table.get(prims(i), gen);
         }
     }
 
@@ -54,7 +48,7 @@ namespace tc {
  * Convert the indexes of this mesh to those of a different context, using g_gens to build the parent context and sg_gens to build this context.
  */
     void recontext(
-        std::vector<Symbol> &prims,
+        ArrayXui &prims,
         const tc::Group &context,
         const Symbol &g_gens,
         const Symbol &sg_gens
@@ -68,33 +62,32 @@ namespace tc {
             return table.get(coset, gen);
         });
 
-        for (Symbol &prim: prims) {
-            for (auto &ind: prim) {
-                ind = map[ind];
-            }
+        for (Eigen::Index i = 0; i < prims.size(); ++i) {
+            prims(i) = map[prims(i)];
         }
     }
 
 /**
  * Union several meshes of the same dimension
  */
-    std::vector<Symbol> merge(const std::vector<std::vector<Symbol>> &meshes) {
-        size_t size = 0;
+    ArrayXui merge(const std::vector<ArrayXui> &meshes) {
+        Eigen::Index cols = 0;
         for (const auto &mesh: meshes) {
-            size += mesh.size();
+            cols += mesh.cols();
         }
 
-        std::vector<Symbol> res;
-        res.reserve(size);
+        ArrayXui res(meshes[0].rows(), cols);
+        Eigen::Index offset = 0;
         for (const auto &mesh: meshes) {
-            res.insert(res.end(), mesh.begin(), mesh.end());
+            res.middleCols(offset, mesh.cols()) << mesh;
+            offset += mesh.cols();
         }
 
         return res;
     }
 
-    std::vector<std::vector<Symbol>> each_tile(
-        std::vector<Symbol> base,
+    std::vector<ArrayXui> each_tile(
+        ArrayXui base,
         const tc::Group &context,
         const Symbol &g_gens,
         const Symbol &sg_gens
@@ -114,63 +107,41 @@ namespace tc {
         return res;
     }
 
-    [[nodiscard]]
-    std::vector<Symbol> tile(
-        std::vector<Symbol> base,
-        const tc::Group &context,
-        const Symbol &g_gens,
-        const Symbol &sg_gens
-    ) {
-        auto res = each_tile(std::move(base), context, g_gens, sg_gens);
-
-        return merge(res);
-    }
-
-/**
+    /**
  * Produce a mesh of primitives that fill out the volume of the subgroup generated by generators g_gens within the group context
  */
-    std::vector<Symbol> triangulate(
+    ArrayXui triangulate(
         const tc::Group &context,
         const Symbol &g_gens
     ) {
         if (g_gens.size() == 0) {
-            std::vector<Symbol> res;
-            Symbol prims(1);
-            prims.setZero();
-            res.push_back(prims);
+            ArrayXui res(1, 1);
+            res.setZero();
             return res;
         }
 
         const auto &combos = combinations(g_gens, g_gens.size() - 1);
 
-        std::vector<std::vector<Symbol>> meshes;
+        std::vector<ArrayXui> meshes;
 
         for (const auto &sg_gens: combos) {
             auto base = triangulate(context, sg_gens);
-            auto raised = tile(base, context, g_gens, sg_gens);
-            raised.erase(raised.begin(), raised.begin() + base.size());
+            auto tiles = each_tile(base, context, g_gens, sg_gens);
+            tiles.erase(tiles.begin(), tiles.begin() + 1);
+            auto raised = merge(tiles);
             auto fanned = fan(raised, 0);
             meshes.push_back(fanned);
         }
 
-        const std::vector<Symbol> &result = merge(meshes);
+        const ArrayXui &result = merge(meshes);
         return result;
     }
 
     template<class T>
-    auto hull(const tc::Group &group, T all_sg_gens, const std::vector<Symbol> &exclude) {
-        std::vector<std::vector<Symbol>> parts;
+    auto hull(const tc::Group &group, T all_sg_gens) {
+        std::vector<ArrayXui> parts;
         auto g_gens = group.gens;
         for (const Symbol &sg_gens: all_sg_gens) {
-            bool excluded = false;
-            for (const auto &test: exclude) {
-                if (sg_gens == test) {
-                    excluded = true;
-                    break;
-                }
-            }
-            if (excluded) continue;
-
             const auto &base = triangulate(group, sg_gens);
             const auto &tiles = each_tile(base, group, g_gens, sg_gens);
             for (const auto &tile: tiles) {
diff --git a/include/tc/group.hpp b/include/tc/group.hpp
index 08112dc..5530706 100644
--- a/include/tc/group.hpp
+++ b/include/tc/group.hpp
@@ -19,6 +19,7 @@ namespace tc {
     using Symbol = Eigen::Vector<unsigned int, Eigen::Dynamic>;
 
     using MatrixXui = Eigen::Matrix<unsigned int, Eigen::Dynamic, Eigen::Dynamic>;
+    using ArrayXui = Eigen::Array<unsigned int, Eigen::Dynamic, Eigen::Dynamic>;
 
     /// A Coxeter Matrix
     class Group : public MatrixXui {