/guava/guava/src/com/google/common/collect/Synchronized.java
if ( ( keySet) == null) {   keySet = set( delegate( ).keySet( ) , mutex) ; }
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} } @Override public Map<K, Collection<V>> asMap() { synchronized (mutex) { if (asMap == null) { <extra_id_0> } return asMap; } } @Override public Multiset<K> keys() {