[iNils]

var winter = ["December", "January", "February"];
var spring = ["March", "April", "May"];
var summer = ["June", "July", "August"];
var autumn = ["September", "October", "November"];
var year = [winter, spring, summer, autumn];
for (i = 0; i < year.length; i++) {
	for (a = 0; a < year[i].length; a++) {
		trace (year[i][a]);
	}
}

объединяет массивы в один.