27? Đi tiếp nhé, 3d g6,g1,đb 4 tay
111,116,122,127,161,166,172,177,211,216,222,227,261,266,272,277,311,316,322,327,361,366,372,377,611,616,622,627,661,666,672,677,711,716,722,727,761,766,772,777,811,811,816,816,822,822,827,827,861,861,866,866,872,872,877,877