/guava/android/guava/src/com/google/common/collect/Iterators.java
checkNotNull( iterable) ;checkNotNull( a) ;
checkNotNull ( a ) ;
checkNotNull(a); checkNotNull(b); return concat(consumingForArray(a, b)); } public static <T extends @Nullable Object> Iterator<T> concat( Iterator<? extends T> a, Iterator<? extends T> b, Iterator<? extends T> c) { <extra_id_0> checkNotNull(b); checkNotNull(c); return concat(consumingForArray(a, b, c)); } public static <T extends @Nullable Object> Iterator<T> concat( Iterator<? extends T> a,