var arr:Array = new Array(); 
arr = ["A","B","C","D","E","F","G","H","I","J","K","L","M","N","O","P","Q","R","S","T","U","V","W","X","Y","Z"]; 
for(var i:Number=0;i<50;i++){ 
var line:String = ""; 
for(var j:Number=0;j<i;j++){ 
var newNum:Number = j+i-1;
var multiply:Number = Math.floor(newNum/arr.length); 
var nowNum = newNum-(arr.length*multiply); 
line += arr[nowNum]; 
} 
trace(line); 
}