diff --git a/pom.xml b/pom.xml
index e683fd4..1f8dcee 100644
--- a/pom.xml
+++ b/pom.xml
@@ -2,7 +2,7 @@
     <modelVersion>4.0.0</modelVersion>
     <groupId>fi.solita.utils</groupId>
     <artifactId>functional-utils</artifactId>
-    <version>0.12.50</version>
+    <version>0.12.52</version>
     <build>
         <resources>
                 <resource>
diff --git a/src/main/java/fi/solita/utils/functional/FunctionalA.java b/src/main/java/fi/solita/utils/functional/FunctionalA.java
index ba9c1fe..820c7f3 100644
--- a/src/main/java/fi/solita/utils/functional/FunctionalA.java
+++ b/src/main/java/fi/solita/utils/functional/FunctionalA.java
@@ -465,6 +465,42 @@ public static final <T> Iterable<T> concat(T[] a, T[] b, T[] c, T[] d, T[] e) {
     public static final <T> Iterable<T> concat(T[] a, T[] b, T[] c, T[] d, T[] e, T[] f) {
         return concat(newList(a), newList(b), newList(c), newList(d), newList(e), newList(f));
     }
+    
+    
+    /**
+     * @see Functional#concat
+     */
+    public static final <T> Iterable<T> concat(T[] a, T[] b, T[] c, T[] d, T[] e, T[] f, T[] g) {
+        return concat(newList(a), newList(b), newList(c), newList(d), newList(e), newList(f), newList(g));
+    }
+    
+    /**
+     * @see Functional#concat
+     */
+    public static final <T> Iterable<T> concat(T[] a, T[] b, T[] c, T[] d, T[] e, T[] f, T[] g, T[] h) {
+        return concat(newList(a), newList(b), newList(c), newList(d), newList(e), newList(f), newList(g), newList(h));
+    }
+    
+    /**
+     * @see Functional#concat
+     */
+    public static final <T> Iterable<T> concat(T[] a, T[] b, T[] c, T[] d, T[] e, T[] f, T[] g, T[] h, T[] i) {
+        return concat(newList(a), newList(b), newList(c), newList(d), newList(e), newList(f), newList(g), newList(h), newList(i));
+    }
+    
+    /**
+     * @see Functional#concat
+     */
+    public static final <T> Iterable<T> concat(T[] a, T[] b, T[] c, T[] d, T[] e, T[] f, T[] g, T[] h, T[] i, T[] j) {
+        return concat(newList(a), newList(b), newList(c), newList(d), newList(e), newList(f), newList(g), newList(h), newList(i), newList(j));
+    }
+    
+    /**
+     * @see Functional#concat
+     */
+    public static final <T> Iterable<T> concat(T[] a, T[] b, T[] c, T[] d, T[] e, T[] f, T[] g, T[] h, T[] i, T[] j, T[] k) {
+        return concat(newList(a), newList(b), newList(c), newList(d), newList(e), newList(f), newList(g), newList(h), newList(i), newList(j), newList(k));
+    }
 
     /**
      * @see Functional#concat
@@ -497,10 +533,45 @@ public static final <T> Iterable<T> concat(Iterable<? extends T> x1, Iterable<?
     /**
      * @see Functional#concat
      */
-    public static final <T> Iterable<T> concat(Iterable<? extends T> x1, Iterable<? extends T> x2, Iterable<? extends T> x3, Iterable<? extends T> x4, Iterable<? extends T> x5, Iterable<? extends T> x6, Iterable<? extends T>... xs) {
-        Iterable<Iterable<? extends T>> a = FunctionalImpl.filter(Predicates.not(Predicates.isNull()), newList(x1, x2, x3, x4, x5, x6));
+    public static final <T> Iterable<T> concat(Iterable<? extends T> x1, Iterable<? extends T> x2, Iterable<? extends T> x3, Iterable<? extends T> x4, Iterable<? extends T> x5, Iterable<? extends T> x6, Iterable<? extends T> x7) {
+        return x1 == null && x2 == null && x3 == null && x4 == null && x5 == null && x6 == null && x7 == null ? null : new ConcatenatingIterable<T>(FunctionalImpl.filter(Predicates.not(Predicates.isNull()), newList(x1, x2, x3, x4, x5, x6, x7)));
+    }
+    
+    /**
+     * @see Functional#concat
+     */
+    public static final <T> Iterable<T> concat(Iterable<? extends T> x1, Iterable<? extends T> x2, Iterable<? extends T> x3, Iterable<? extends T> x4, Iterable<? extends T> x5, Iterable<? extends T> x6, Iterable<? extends T> x7, Iterable<? extends T> x8) {
+        return x1 == null && x2 == null && x3 == null && x4 == null && x5 == null && x6 == null && x7 == null && x8 == null ? null : new ConcatenatingIterable<T>(FunctionalImpl.filter(Predicates.not(Predicates.isNull()), newList(x1, x2, x3, x4, x5, x6, x7, x8)));
+    }
+    
+    /**
+     * @see Functional#concat
+     */
+    public static final <T> Iterable<T> concat(Iterable<? extends T> x1, Iterable<? extends T> x2, Iterable<? extends T> x3, Iterable<? extends T> x4, Iterable<? extends T> x5, Iterable<? extends T> x6, Iterable<? extends T> x7, Iterable<? extends T> x8, Iterable<? extends T> x9) {
+        return x1 == null && x2 == null && x3 == null && x4 == null && x5 == null && x6 == null && x7 == null && x8 == null && x9 == null ? null : new ConcatenatingIterable<T>(FunctionalImpl.filter(Predicates.not(Predicates.isNull()), newList(x1, x2, x3, x4, x5, x6, x7, x8, x9)));
+    }
+    
+    /**
+     * @see Functional#concat
+     */
+    public static final <T> Iterable<T> concat(Iterable<? extends T> x1, Iterable<? extends T> x2, Iterable<? extends T> x3, Iterable<? extends T> x4, Iterable<? extends T> x5, Iterable<? extends T> x6, Iterable<? extends T> x7, Iterable<? extends T> x8, Iterable<? extends T> x9, Iterable<? extends T> x10) {
+        return x1 == null && x2 == null && x3 == null && x4 == null && x5 == null && x6 == null && x7 == null && x8 == null && x9 == null && x10 == null ? null : new ConcatenatingIterable<T>(FunctionalImpl.filter(Predicates.not(Predicates.isNull()), newList(x1, x2, x3, x4, x5, x6, x7, x8, x9, x10)));
+    }
+    
+    /**
+     * @see Functional#concat
+     */
+    public static final <T> Iterable<T> concat(Iterable<? extends T> x1, Iterable<? extends T> x2, Iterable<? extends T> x3, Iterable<? extends T> x4, Iterable<? extends T> x5, Iterable<? extends T> x6, Iterable<? extends T> x7, Iterable<? extends T> x8, Iterable<? extends T> x9, Iterable<? extends T> x10, Iterable<? extends T> x11) {
+        return x1 == null && x2 == null && x3 == null && x4 == null && x5 == null && x6 == null && x7 == null && x8 == null && x9 == null && x10 == null && x11 == null ? null : new ConcatenatingIterable<T>(FunctionalImpl.filter(Predicates.not(Predicates.isNull()), newList(x1, x2, x3, x4, x5, x6, x7, x8, x9, x10, x11)));
+    }
+    
+    /**
+     * @see Functional#concat
+     */
+    public static final <T> Iterable<T> concat(Iterable<? extends T> x1, Iterable<? extends T> x2, Iterable<? extends T> x3, Iterable<? extends T> x4, Iterable<? extends T> x5, Iterable<? extends T> x6, Iterable<? extends T> x7, Iterable<? extends T> x8, Iterable<? extends T> x9, Iterable<? extends T> x10, Iterable<? extends T> x11, Iterable<? extends T>... xs) {
+        Iterable<Iterable<? extends T>> a = FunctionalImpl.filter(Predicates.not(Predicates.isNull()), newList(x1, x2, x3, x4, x5, x6, x7, x8, x9, x10, x11));
         Iterable<Iterable<? extends T>> b = filter(Predicates.not(Predicates.isNull()), xs);
-        return x1 == null && x2 == null && x3 == null && x4 == null && x5 == null && x6 == null && xs == null ? null : new ConcatenatingIterable<T>(FunctionalImpl.concat(a, b));
+        return x1 == null && x2 == null && x3 == null && x4 == null && x5 == null && x6 == null && x7 == null && x8 == null && x9 == null && x10 == null && x11 == null && xs == null ? null : new ConcatenatingIterable<T>(FunctionalImpl.concat(a, b));
     }
     
     
@@ -889,8 +960,15 @@ public static final <P,T,R> ApplyBi<P,T,T> combineEndo(final Apply<P,? extends A
     /**
      * @see Functional#combineEndo
      */
-    public static final <P,T,R> ApplyBi<P,T,T> combineEndo(final Apply<P,? extends Apply<T,T>> f1, final Apply<P,? extends Apply<T,T>> f2, final Apply<P,? extends Apply<T,T>> f3, final Apply<P,? extends Apply<T,T>> f4, final Apply<P,? extends Apply<T,T>> f5, final Apply<P,? extends Apply<T,T>>... fs) {
-        return FunctionalImpl.combineEndo(concat(newList(f1, f2, f3, f4, f5), fs));
+    public static final <P,T,R> ApplyBi<P,T,T> combineEndo(final Apply<P,? extends Apply<T,T>> f1, final Apply<P,? extends Apply<T,T>> f2, final Apply<P,? extends Apply<T,T>> f3, final Apply<P,? extends Apply<T,T>> f4, final Apply<P,? extends Apply<T,T>> f5) {
+        return FunctionalImpl.combineEndo(newList(f1, f2, f3, f4, f5));
+    }
+    
+    /**
+     * @see Functional#combineEndo
+     */
+    public static final <P,T,R> ApplyBi<P,T,T> combineEndo(final Apply<P,? extends Apply<T,T>> f1, final Apply<P,? extends Apply<T,T>> f2, final Apply<P,? extends Apply<T,T>> f3, final Apply<P,? extends Apply<T,T>> f4, final Apply<P,? extends Apply<T,T>> f5, final Apply<P,? extends Apply<T,T>> f6, final Apply<P,? extends Apply<T,T>>... fs) {
+        return FunctionalImpl.combineEndo(concat(newList(f1, f2, f3, f4, f5, f6), fs));
     }