图形题 要求输出以下图形
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我写的程序是：
CLEAR
FOR i=-3 to 3
FOR j=1 to 2*ABS(i)+2
@2+i,30-ABS(i)+j say"*"
ENDFOR
ENDFOR
RETURN

可是运行出来结果是
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我找不出错误，请高手指教一下　谢谢