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/*
* Copyright (c) 2017 - present Facebook, Inc.
* All rights reserved.
*
* This source code is licensed under the BSD style license found in the
* LICENSE file in the root directory of this source tree. An additional grant
* of patent rights can be found in the PATENTS file in the same directory.
*/
extern int nondet_int();
extern char* nondet_string();
void loop() {
int i = 0;
char* s = nondet_string();
while (nondet_int()) {
s[i++] = "0123456789ABCDEF"[nondet_int() % 16];
}
}