attr2.clear();
attr2.add( BYTES1, ( byte[] ) null, BYTES3 );
assertFalse( attr2.remove( NULL_STRING_VALUE, BIN_VALUE1 ) );
assertEquals( 2, attr2.size() );
attr2.clear();
attr2.add( BYTES1, ( byte[] ) null, BYTES2 );
attr2.add( "c" );
assertEquals( 4, attr2.size() );
assertFalse( attr2.remove( NULL_STRING_VALUE, BIN_VALUE1, STR_VALUE3 ) );
assertEquals( 3, attr2.size() );