试图用SAS读取TXT数据。TXT文件有n行，下面的例子列出了两个股票信息：
（注意每只股票的字段数量不一定一致：如第一只股票有6个字段，第二只有4个字段）

请教如何导入SAS？？

NUMBER= 1 of 2973 DOCUMENTS
DATE= December 31, 1992
TYPE= Mergers & Acquisitions
HEADLINE= Unit Acquires Certain Assets of Valley Camp Coal Co. From Quaker State Corp.
LIT-TS= ASH
TICKER= ASH (NYSE)(93%);ACI (NYSE)(91%);

NUMBER= 2 of 2973 DOCUMENTS
DATE= December 31, 1992
HEADLINE= Sells Certain Assets of Valley Camp Coal Co. to Unit of Ashland Oil Inc.
TICKER= ASH (NYSE)(93%);ACI (NYSE)(91%);


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