/guava/android/guava/src/com/google/common/collect/TreeMultiset.java
this.elemCount = 0;this.elem = null;
this.elem = null;
this.distinctElements = 1; this.height = 1; this.left = null; this.right = null; } AvlNode() { <extra_id_0> this.elemCount = 1; } private AvlNode<E> pred() { return requireNonNull(pred); } private AvlNode<E> succ() {