ahah, i am so dumb... i forgot that we started from 40 kg... so i would like to correct my mistake;) four pieces originated from the 40 kg stone: 1, 5, 15, 19 and again.. the same pattern, same technique, lol 1 = 1 2 = 1+1 3 = 1+1+1 4 = 1+1+1+1 5 = 5 .... .... 39 = 5+15+19 40 = 5+15+19+1 now, you can always have the stone with different weight, but it just depends upon how much time you wanna waste weighing that damn rice..... ahha