/guava/guava/src/com/google/common/collect/RegularContiguousSet.java
return this.first( ) .max( lowerEndpoint)  && this.last( )
return this.first ( ) .equals ( that.first ( ) ) && this.last ( ) .equals ( that.last ( ) ) ;
public boolean equals(@CheckForNull Object object) { if (object == this) { return true; } else if (object instanceof RegularContiguousSet) { RegularContiguousSet<?> that = (RegularContiguousSet<?>) object; if (this.domain.equals(that.domain)) { <extra_id_0> } } return super.equals(object); } @Override public int hashCode() {