刚接触SAS，按照书上的例子输入数据，可是我写了5个观测，却只能输出2个，请帮忙看看哪出错了，程序如下


libname L1 'E:\my sas';
data L1.stu0;
input name $1-12 brith yymmdd10. +1 age +1 inday yymmdd10. +1 num math english var soc $;
var=(math+english)/2;
if var>70 then soc='T';
else soc='F';
cards;
zhangaitao  1985/05/21 25 2004/09/01 20800475 87 89
zhangaijing 1988/02/15 22 2006/09/01 20900987 67 86
ianlingling   1987/08/26 23 2006/09/01 20900568 85 90
lujixiao        1985/10/23 25 2004/09/01 20004762 54 63
hanwei       1985/12/23 25 2004/09/10 20400987 35 80
;
proc print;
format brith inday mmddyy8.;
run;