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switch(i){
case 1-9:
break;
case 10-19:
break;
case 20-29:
break;
}
switch(i){
case 1,2,3,4,5,6,7,8,9:
break;
case 10,11,12,13,14,15,16,17,18,19:
break;
case 20,21,22,23,24,25,26,27,28,29:
break;
}