data recognition;
input medium $ time value;
cards;
TV 5 49 
TV 5 39 
TV 10 50 
TV 10 55 
TV 15 43 
TV 15 38 
TV 20 53 
TV 20 48 
AUDIO 5 55 
AUDIO 5 41 
AUDIO 10 67 
AUDIO 10 58 
AUDIO 15 53 
AUDIO 20 85 
WRITE 5 66 
WRITE 5 68 
WRITE 10 85 
WRITE 10 92 
WRITE 15 69 
WRITE 15 62 
WRITE 20 85
;
run;