diff --git a/.gitignore b/.gitignore
index dbea2fb..ab68b97 100644
--- a/.gitignore
+++ b/.gitignore
@@ -14,3 +14,4 @@ tmp-dir/
 site/data/latest-canonical*.json*
 site/output
 copy
+patterns
diff --git a/patterns.js b/patterns.js
new file mode 100644
index 0000000..7d4d4bd
--- /dev/null
+++ b/patterns.js
@@ -0,0 +1,62 @@
+const fs = require("fs");
+const analysis = require("./analysis");
+const knn = require("./site/js/knn");
+
+if (!fs.existsSync("patterns")) fs.mkdirSync("patterns");
+
+if (!fs.existsSync("patterns/sorted-billa-spar.json")) {
+    const items = analysis.readJSON("data/latest-canonical.json.br");
+    const billaSparItem = items
+        .filter((item) => item.store == "billa" || item.store == "spar")
+        .filter((item) => {
+            return !(
+                item.name.includes("Clever") ||
+                item.name.includes("S-BUDGET") ||
+                item.name.includes("Ja! Natürlich") ||
+                item.name.includes("SPAR") ||
+                item.name.includes("BILLA")
+            );
+        });
+    knn.vectorizeItems(billaSparItem);
+    const billaItems = billaSparItem.filter((item) => item.store == "billa");
+    const sparItems = billaSparItem.filter((item) => item.store == "spar");
+
+    console.log(billaItems.length + " " + sparItems.length);
+    const sortedItems = [];
+
+    sparItems.forEach((item) => (item.sorted = false));
+    const total = billaItems.length;
+    while (billaItems.length > 0) {
+        const refItem = billaItems.shift();
+        const similar = knn.findMostSimilarItem(refItem, sparItems);
+        if (similar.item != null) {
+            sortedItems.push(refItem);
+            sortedItems.push(similar.item);
+        } else {
+            console.log("No similar item found for " + refItem.name);
+        }
+        if (sortedItems.length % 100 == 0) console.log(sortedItems.length / 2 + "/" + total);
+    }
+    analysis.writeJSON("patterns/sorted-billa-spar.json", sortedItems);
+}
+
+const sortedItems = analysis.readJSON("patterns/sorted-billa-spar.json");
+const filteredItems = [];
+let result = "";
+for (let i = 0; i < sortedItems.length; i += 2) {
+    const a = sortedItems[i];
+    const b = sortedItems[i + 1];
+    const similarity = knn.dotProduct(a.vector, b.vector);
+    result += "billa " + a.name + "\n";
+    result += "spar  " + b.name + " " + similarity.toFixed(5) + "\n\n";
+
+    if (b.priceHistory.some((price) => price.price == a.price) && a.quantity == b.quantity) {
+        filteredItems.push(a);
+        filteredItems.push(b);
+    }
+}
+console.log("Sorted: " + sortedItems.length);
+analysis.writeJSON("patterns/sorted-billa-spar-cart.json", { name: "Billa Spar Sortiert", items: sortedItems });
+console.log("Filtered: " + filteredItems.length);
+analysis.writeJSON("patterns/sorted-billa-spar-filtered-cart.json", { name: "Billa Spar Sortiert Gefiltert", items: filteredItems });
+fs.writeFileSync("patterns/sorted-billa-spar.txt", result, "utf-8");
diff --git a/site/cart.js b/site/cart.js
index 32e20ed..29e9dc9 100644
--- a/site/cart.js
+++ b/site/cart.js
@@ -133,7 +133,7 @@ function loadCart() {
     });
     cartList.elements.numItemsLabel.innerHTML = "<strong>Artikel:</strong>";
     cartList.elements.enableChart.checked = true;
-    cartList.elements.chart.elements.sumStores.checked = true;
+    cartList.elements.chart.elements.sumStores.checked = models.items.length < 2000;
 
     if (cart.items.length == 0) {
         elements.noItems.classList.remove("hidden");
diff --git a/site/js/knn.js b/site/js/knn.js
index 9abde06..703eb1b 100644
--- a/site/js/knn.js
+++ b/site/js/knn.js
@@ -46,14 +46,19 @@ function findMostSimilarItem(refItem, items) {
     let maxSimilarity = -1;
     let similarItem = null;
     let similarItemIdx = -1;
-    items.forEach((item, idx) => {
+    for (let idx = 0; idx < items.length; idx++) {
+        const item = items[idx];
+        if (item.sorted) continue;
         let similarity = dotProduct(refItem.vector, item.vector);
-        if (similarity > maxSimilarity) {
+        if (similarity > maxSimilarity || similarity > 0.9999999) {
             maxSimilarity = similarity;
             similarItem = item;
             similarItemIdx = idx;
         }
-    });
+        if (similarity > 0.9999999) {
+            break;
+        }
+    }
     return {
         similarity: maxSimilarity,
         item: similarItem,
@@ -96,16 +101,19 @@ function findMostSimilarItems(refItem, items, k = 5, accept = (ref, item) => tru
 }
 exports.findMostSimilarItems = findMostSimilarItems;
 
-function similaritySortItems(items) {
+function similaritySortItems(items, progress) {
     if (items.length == 0) return items;
     sortedItems = [items.shift()];
     let refItem = sortedItems[0];
-    while (items.length > 0) {
+    items.forEach((item) => (item.sorted = false));
+    while (items.length != sortedItems.length) {
         const similarItem = findMostSimilarItem(refItem, items);
         sortedItems.push(similarItem.item);
-        items.splice(similarItem.index, 1);
+        similarItem.item.sorted = true;
         refItem = similarItem.item;
+        if (progress) progress(sortedItems, items);
     }
+    items.forEach((item) => delete item.sorted);
     return sortedItems;
 }
 exports.similaritySortItems = similaritySortItems;
diff --git a/site/model/carts.js b/site/model/carts.js
index 3a03d8a..bc3c334 100644
--- a/site/model/carts.js
+++ b/site/model/carts.js
@@ -36,7 +36,16 @@ class Carts extends Model {
     }
 
     save() {
-        localStorage.setItem("carts", JSON.stringify(this._carts, null, 2));
+        const carts = [];
+        for (const cart of this._carts) {
+            carts.push({
+                name: cart.name,
+                items: cart.items.map((item) => {
+                    return { store: item.store, id: item.id };
+                }),
+            });
+        }
+        localStorage.setItem("carts", JSON.stringify(carts, null, 2));
         this.notify();
     }