diff --git a/README.md b/README.md
new file mode 100644
index 0000000..bf8692e
--- /dev/null
+++ b/README.md
@@ -0,0 +1,6 @@
+[ ![Download](https://api.bintray.com/packages/vorpal-research/kotlin-maven/kotlin-wheels/images/download.svg) ](https://bintray.com/vorpal-research/kotlin-maven/kotlin-wheels/_latestVersion)
+
+# Kotlin wheels
+
+My personal collection of utils used across my other projects
+
diff --git a/src/main/kotlin/ru/spbstu/wheels/MDMaps.kt b/src/main/kotlin/ru/spbstu/wheels/MDMaps.kt
index d0b4433..e4c0df5 100644
--- a/src/main/kotlin/ru/spbstu/wheels/MDMaps.kt
+++ b/src/main/kotlin/ru/spbstu/wheels/MDMaps.kt
@@ -8,6 +8,8 @@ abstract class MDMap<K, V>(val inner: MutableMap<K, V> = mutableMapOf()) {
     operator fun get(key: K): V = inner.getOrPut(key, this::defaultValue)
     operator fun set(key: K, value: V) = inner.set(key, value)
 
+    fun remove(key: K) { inner.remove(key) }
+
     companion object {
         inline fun <K, V> withDefault(crossinline default: () -> V): MDMap<K, V> = object : MDMap<K, V>() {
             override fun defaultValue(): V = default()
@@ -51,6 +53,32 @@ inline operator fun <K1, K2, VS> MutableMap2D<K1, K2, VS>.get(key1: K1, key2: K2
 inline operator fun <K1, K2, VS> MutableMap2D<K1, K2, VS>.set(key1: K1, key2: K2, value: VS) =
         this[key1].set(key2, value)
 
+@Suppress(Warnings.NOTHING_TO_INLINE)
+inline fun <K1, K2, VS> MutableMap2D<K1, K2, VS>.remove(key1: K1, key2: K2) {
+    val mLevel1 = this.inner[key1] ?: return
+    mLevel1.remove(key2)
+    if(mLevel1.isEmpty()) remove(key1)
+}
+
+@Suppress(Warnings.NOTHING_TO_INLINE)
+inline fun <K1, K2, VS> MutableMap2D<K1, K2, VS>.getOrPut(key1: K1, key2: K2, defaultValue: () -> VS) =
+        this[key1].getOrPut(key2, defaultValue)
+
+@Suppress(Warnings.NOTHING_TO_INLINE)
+inline operator fun <K1, K2, VS> MutableMap2D<K1, K2, VS>.plusAssign(triple: Triple<K1, K2, VS>) {
+    this[triple.first, triple.second] = triple.third
+}
+
+@Suppress(Warnings.NOTHING_TO_INLINE)
+inline operator fun <K1, K2, VS> MutableMap2D<K1, K2, VS>.plusAssign(triples: Iterable<Triple<K1, K2, VS>>) {
+    for(triple in triples) plusAssign(triple)
+}
+
+@Suppress(Warnings.NOTHING_TO_INLINE)
+inline operator fun <K1, K2, VS> MutableMap2D<K1, K2, VS>.plusAssign(triples: Sequence<Triple<K1, K2, VS>>) {
+    for(triple in triples) plusAssign(triple)
+}
+
 typealias MutableMap3D<K1, K2, K3, VS> = MDMap<K1, MutableMap2D<K2, K3, VS>>
 
 fun <K1, K2, K3, VS> MutableMap3D(): MutableMap3D<K1, K2, K3, VS> = MDMap.withDefault { MutableMap2D<K2, K3, VS>() }
@@ -66,3 +94,16 @@ inline operator fun <K1, K2, K3, VS> MutableMap3D<K1, K2, K3, VS>.get(key1: K1,
 @Suppress(Warnings.NOTHING_TO_INLINE)
 inline operator fun <K1, K2, K3, VS> MutableMap3D<K1, K2, K3, VS>.set(key1: K1, key2: K2, key3: K3, value: VS) =
         this[key1][key2].set(key3, value)
+
+@Suppress(Warnings.NOTHING_TO_INLINE)
+inline fun <K1, K2, K3, VS> MutableMap3D<K1, K2, K3, VS>.remove(key1: K1, key2: K2, key3: K3) {
+    val mLevel1 = this.inner[key1] ?: return
+    val mLevel2 = mLevel1.inner[key2] ?: return
+    mLevel2.remove(key3)
+    if(mLevel2.isEmpty()) mLevel1.inner.remove(key2)
+    if(mLevel1.inner.isEmpty()) this.remove(key1)
+}
+
+@Suppress(Warnings.NOTHING_TO_INLINE)
+inline fun <K1, K2, K3, VS> MutableMap3D<K1, K2, K3, VS>.getOrPut(key1: K1, key2: K2, key3: K3, defaultValue: () -> VS) =
+        this[key1][key2].getOrPut(key3, defaultValue)