my data are a five point likert scale with 21 questions. The answers were recorded as string variables and some have special characters. My charlist result is as follows

. return list

macros:
r(chars) : "/KNSabegijklmnpsu"
r(sepchars) : "/ K N S a b e g i j k l m n p s u "
r(ascii) : "47 75 78 83 97 98 101 103 105 106 107 108 109 110 .."

How do I use the code "foreach in a loop to remove the special characters in all the rows and columns and to destring the variables?