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try {
int len = is.read (arr);
for (int i = 0; i < len; i++) {
if (arr[i] >= 0 && arr[i] <= 31 && arr[i] != '\n' && arr[i] != '\r' && arr[i] != '\t') {
if (arr[i] >= 0 && arr[i] <= 31 && arr[i] != '\n' && arr[i] != '\r' && arr[i] != '\t' && arr[i] != '\f') {
return;
}