请问一下，“NOTE 49-169: The meaning of an identifier after a quoted string may change in a future SAS release.  
Inserting white space between a quoted string and the succeeding identifier is recommended.
”出现这个提示是怎么回事？
还有这个“WARNING: The quoted string currently being processed has become more than 262 characters long.  
You may have unbalanced quotation marks.”


代码如下：
（1）
DATA PAY;
INPUT NUM p @@;
CARDS;
123 200.5 125 134.7 126 109 121 39.5 123 345.6 126 330
121 110 125 290.5 121 580.5 123 55.9 126 90.8;
PROC SORT DATA=PAY;
BY NUM;
PROC PRINT;
TITLE 'PAY AFTER SORTING';
RUN;
（2）
DATA REPEAT;
        INPUT NUM MEASURE1-MEASURE3 @@;
                DROP MEASURE1-MEASURE3;
                MEASURE=MEASURE1;
                OUTPUT;
                MEASURE=MEASURE2;
                OUTPUT;
                MEASURE=MEASURE3;
                OUTPUT;
                CARDS;
                101  92 85 94 102  73 86 62
                ;
                PROC PRINT;
                        TITLE 'DATA SET REPEAT';
                RUN;